1c1e2e8b71
HAST allows to transparently store data on two physically separated machines connected over the TCP/IP network. HAST works in Primary-Secondary (Master-Backup, Master-Slave) configuration, which means that only one of the cluster nodes can be active at any given time. Only Primary node is able to handle I/O requests to HAST-managed devices. Currently HAST is limited to two cluster nodes in total. HAST operates on block level - it provides disk-like devices in /dev/hast/ directory for use by file systems and/or applications. Working on block level makes it transparent for file systems and applications. There in no difference between using HAST-provided device and raw disk, partition, etc. All of them are just regular GEOM providers in FreeBSD. For more information please consult hastd(8), hastctl(8) and hast.conf(5) manual pages, as well as http://wiki.FreeBSD.org/HAST. Sponsored by: FreeBSD Foundation Sponsored by: OMCnet Internet Service GmbH Sponsored by: TransIP BV
427 lines
10 KiB
C
427 lines
10 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 <sys/types.h>
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#include <sys/wait.h>
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#include <signal.h>
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#include <assert.h>
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#include <errno.h>
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#include <pthread.h>
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#include <stdio.h>
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#include <string.h>
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#include "hast.h"
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#include "hastd.h"
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#include "hast_proto.h"
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#include "nv.h"
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#include "pjdlog.h"
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#include "proto.h"
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#include "subr.h"
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#include "control.h"
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static void
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control_set_role(struct hastd_config *cfg, struct nv *nvout, uint8_t role,
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struct hast_resource *res, const char *name, unsigned int no)
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{
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assert(cfg != NULL);
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assert(nvout != NULL);
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assert(name != NULL);
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/* Name is always needed. */
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nv_add_string(nvout, name, "resource%u", no);
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if (res == NULL) {
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TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) {
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if (strcmp(res->hr_name, name) == 0)
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break;
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}
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if (res == NULL) {
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nv_add_int16(nvout, EHAST_NOENTRY, "error%u", no);
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return;
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}
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}
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assert(res != NULL);
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/* Send previous role back. */
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nv_add_string(nvout, role2str(res->hr_role), "role%u", no);
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/* Nothing changed, return here. */
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if (role == res->hr_role)
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return;
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pjdlog_prefix_set("[%s] (%s) ", res->hr_name, role2str(res->hr_role));
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pjdlog_info("Role changed to %s.", role2str(role));
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/* Change role to the new one. */
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res->hr_role = role;
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pjdlog_prefix_set("[%s] (%s) ", res->hr_name, role2str(res->hr_role));
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/*
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* If previous role was primary or secondary we have to kill process
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* doing that work.
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*/
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if (res->hr_workerpid != 0) {
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if (kill(res->hr_workerpid, SIGTERM) < 0) {
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pjdlog_errno(LOG_WARNING,
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"Unable to kill worker process %u",
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(unsigned int)res->hr_workerpid);
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} else if (waitpid(res->hr_workerpid, NULL, 0) !=
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res->hr_workerpid) {
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pjdlog_errno(LOG_WARNING,
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"Error while waiting for worker process %u",
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(unsigned int)res->hr_workerpid);
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} else {
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pjdlog_debug(1, "Worker process %u stopped.",
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(unsigned int)res->hr_workerpid);
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}
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res->hr_workerpid = 0;
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}
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/* Start worker process if we are changing to primary. */
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if (role == HAST_ROLE_PRIMARY)
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hastd_primary(res);
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pjdlog_prefix_set("%s", "");
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}
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static void
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control_status_worker(struct hast_resource *res, struct nv *nvout,
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unsigned int no)
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{
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struct nv *cnvin, *cnvout;
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const char *str;
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int error;
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cnvin = cnvout = NULL;
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error = 0;
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/*
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* Prepare and send command to worker process.
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*/
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cnvout = nv_alloc();
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nv_add_uint8(cnvout, HASTCTL_STATUS, "cmd");
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error = nv_error(cnvout);
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if (error != 0) {
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/* LOG */
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goto end;
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}
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if (hast_proto_send(res, res->hr_ctrl, cnvout, NULL, 0) < 0) {
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error = errno;
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/* LOG */
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goto end;
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}
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/*
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* Receive response.
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*/
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if (hast_proto_recv_hdr(res->hr_ctrl, &cnvin) < 0) {
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error = errno;
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/* LOG */
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goto end;
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}
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error = nv_get_int64(cnvin, "error");
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if (error != 0)
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goto end;
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if ((str = nv_get_string(cnvin, "status")) == NULL) {
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error = ENOENT;
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/* LOG */
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goto end;
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}
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nv_add_string(nvout, str, "status%u", no);
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nv_add_uint64(nvout, nv_get_uint64(cnvin, "dirty"), "dirty%u", no);
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nv_add_uint32(nvout, nv_get_uint32(cnvin, "extentsize"),
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"extentsize%u", no);
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nv_add_uint32(nvout, nv_get_uint32(cnvin, "keepdirty"),
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"keepdirty%u", no);
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end:
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if (cnvin != NULL)
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nv_free(cnvin);
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if (cnvout != NULL)
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nv_free(cnvout);
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if (error != 0)
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nv_add_int16(nvout, error, "error");
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}
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static void
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control_status(struct hastd_config *cfg, struct nv *nvout,
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struct hast_resource *res, const char *name, unsigned int no)
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{
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assert(cfg != NULL);
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assert(nvout != NULL);
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assert(name != NULL);
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/* Name is always needed. */
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nv_add_string(nvout, name, "resource%u", no);
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if (res == NULL) {
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TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) {
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if (strcmp(res->hr_name, name) == 0)
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break;
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}
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if (res == NULL) {
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nv_add_int16(nvout, EHAST_NOENTRY, "error%u", no);
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return;
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}
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}
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assert(res != NULL);
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nv_add_string(nvout, res->hr_provname, "provname%u", no);
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nv_add_string(nvout, res->hr_localpath, "localpath%u", no);
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nv_add_string(nvout, res->hr_remoteaddr, "remoteaddr%u", no);
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switch (res->hr_replication) {
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case HAST_REPLICATION_FULLSYNC:
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nv_add_string(nvout, "fullsync", "replication%u", no);
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break;
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case HAST_REPLICATION_MEMSYNC:
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nv_add_string(nvout, "memsync", "replication%u", no);
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break;
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case HAST_REPLICATION_ASYNC:
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nv_add_string(nvout, "async", "replication%u", no);
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break;
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default:
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nv_add_string(nvout, "unknown", "replication%u", no);
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break;
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}
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nv_add_string(nvout, role2str(res->hr_role), "role%u", no);
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switch (res->hr_role) {
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case HAST_ROLE_PRIMARY:
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assert(res->hr_workerpid != 0);
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/* FALLTHROUGH */
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case HAST_ROLE_SECONDARY:
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if (res->hr_workerpid != 0)
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break;
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/* FALLTHROUGH */
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default:
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return;
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}
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/*
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* If we are here, it means that we have a worker process, which we
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* want to ask some questions.
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*/
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control_status_worker(res, nvout, no);
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}
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void
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control_handle(struct hastd_config *cfg)
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{
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struct proto_conn *conn;
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struct nv *nvin, *nvout;
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unsigned int ii;
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const char *str;
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uint8_t cmd, role;
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int error;
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if (proto_accept(cfg->hc_controlconn, &conn) < 0) {
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pjdlog_errno(LOG_ERR, "Unable to accept control connection");
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return;
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}
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nvin = nvout = NULL;
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role = HAST_ROLE_UNDEF;
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if (hast_proto_recv_hdr(conn, &nvin) < 0) {
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pjdlog_errno(LOG_ERR, "Unable to receive control header");
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nvin = NULL;
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goto close;
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}
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/* Obtain command code. 0 means that nv_get_uint8() failed. */
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cmd = nv_get_uint8(nvin, "cmd");
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if (cmd == 0) {
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pjdlog_error("Control header is missing 'cmd' field.");
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error = EHAST_INVALID;
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goto close;
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}
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/* Allocate outgoing nv structure. */
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nvout = nv_alloc();
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if (nvout == NULL) {
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pjdlog_error("Unable to allocate header for control response.");
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error = EHAST_NOMEMORY;
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goto close;
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}
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error = 0;
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str = nv_get_string(nvin, "resource0");
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if (str == NULL) {
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pjdlog_error("Control header is missing 'resource0' field.");
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error = EHAST_INVALID;
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goto fail;
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}
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if (cmd == HASTCTL_SET_ROLE) {
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role = nv_get_uint8(nvin, "role");
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switch (role) {
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case HAST_ROLE_INIT: /* Is that valid to set, hmm? */
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case HAST_ROLE_PRIMARY:
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case HAST_ROLE_SECONDARY:
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break;
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default:
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pjdlog_error("Invalid role received (%hhu).", role);
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error = EHAST_INVALID;
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goto fail;
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}
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}
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if (strcmp(str, "all") == 0) {
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struct hast_resource *res;
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/* All configured resources. */
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ii = 0;
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TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) {
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switch (cmd) {
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case HASTCTL_SET_ROLE:
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control_set_role(cfg, nvout, role, res,
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res->hr_name, ii++);
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break;
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case HASTCTL_STATUS:
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control_status(cfg, nvout, res, res->hr_name,
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ii++);
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break;
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default:
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pjdlog_error("Invalid command received (%hhu).",
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cmd);
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error = EHAST_UNIMPLEMENTED;
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goto fail;
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}
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}
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} else {
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/* Only selected resources. */
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for (ii = 0; ; ii++) {
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str = nv_get_string(nvin, "resource%u", ii);
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if (str == NULL)
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break;
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switch (cmd) {
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case HASTCTL_SET_ROLE:
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control_set_role(cfg, nvout, role, NULL, str,
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ii);
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break;
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case HASTCTL_STATUS:
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control_status(cfg, nvout, NULL, str, ii);
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break;
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default:
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pjdlog_error("Invalid command received (%hhu).",
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cmd);
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error = EHAST_UNIMPLEMENTED;
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goto fail;
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}
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}
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}
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if (nv_error(nvout) != 0)
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goto close;
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fail:
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if (error != 0)
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nv_add_int16(nvout, error, "error");
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if (hast_proto_send(NULL, conn, nvout, NULL, 0) < 0)
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pjdlog_errno(LOG_ERR, "Unable to send control response");
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close:
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if (nvin != NULL)
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nv_free(nvin);
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if (nvout != NULL)
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nv_free(nvout);
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proto_close(conn);
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}
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/*
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* Thread handles control requests from the parent.
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*/
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void *
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ctrl_thread(void *arg)
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{
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struct hast_resource *res = arg;
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struct nv *nvin, *nvout;
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uint8_t cmd;
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for (;;) {
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if (hast_proto_recv_hdr(res->hr_ctrl, &nvin) < 0) {
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if (sigexit_received)
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pthread_exit(NULL);
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pjdlog_errno(LOG_ERR,
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"Unable to receive control message");
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continue;
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}
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cmd = nv_get_uint8(nvin, "cmd");
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if (cmd == 0) {
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pjdlog_error("Control message is missing 'cmd' field.");
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nv_free(nvin);
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continue;
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}
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nv_free(nvin);
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nvout = nv_alloc();
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switch (cmd) {
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case HASTCTL_STATUS:
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if (res->hr_remotein != NULL &&
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res->hr_remoteout != NULL) {
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nv_add_string(nvout, "complete", "status");
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} else {
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nv_add_string(nvout, "degraded", "status");
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}
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nv_add_uint32(nvout, (uint32_t)res->hr_extentsize,
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"extentsize");
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if (res->hr_role == HAST_ROLE_PRIMARY) {
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nv_add_uint32(nvout,
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(uint32_t)res->hr_keepdirty, "keepdirty");
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nv_add_uint64(nvout,
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(uint64_t)(activemap_ndirty(res->hr_amp) *
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res->hr_extentsize), "dirty");
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} else {
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nv_add_uint32(nvout, (uint32_t)0, "keepdirty");
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nv_add_uint64(nvout, (uint64_t)0, "dirty");
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}
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break;
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default:
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nv_add_int16(nvout, EINVAL, "error");
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break;
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}
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if (nv_error(nvout) != 0) {
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pjdlog_error("Unable to create answer on control message.");
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nv_free(nvout);
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continue;
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}
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if (hast_proto_send(NULL, res->hr_ctrl, nvout, NULL, 0) < 0) {
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pjdlog_errno(LOG_ERR,
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"Unable to send reply to control message");
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}
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nv_free(nvout);
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}
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/* NOTREACHED */
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return (NULL);
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}
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