32115b105a
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
191 lines
5.5 KiB
C
191 lines
5.5 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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* $FreeBSD$
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*/
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#ifndef _HAST_H_
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#define _HAST_H_
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#include <sys/queue.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <limits.h>
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#include <pthread.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <activemap.h>
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#include "proto.h"
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#define HAST_PROTO_VERSION 0
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#define EHAST_OK 0
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#define EHAST_NOENTRY 1
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#define EHAST_INVALID 2
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#define EHAST_NOMEMORY 3
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#define EHAST_UNIMPLEMENTED 4
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#define HASTCTL_CMD_UNKNOWN 0
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#define HASTCTL_CMD_SETROLE 1
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#define HASTCTL_CMD_STATUS 2
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#define HAST_ROLE_UNDEF 0
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#define HAST_ROLE_INIT 1
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#define HAST_ROLE_PRIMARY 2
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#define HAST_ROLE_SECONDARY 3
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#define HAST_SYNCSRC_UNDEF 0
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#define HAST_SYNCSRC_PRIMARY 1
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#define HAST_SYNCSRC_SECONDARY 2
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#define HIO_UNDEF 0
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#define HIO_READ 1
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#define HIO_WRITE 2
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#define HIO_DELETE 3
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#define HIO_FLUSH 4
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#define HAST_CONFIG "/etc/hast.conf"
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#define HAST_CONTROL "/var/run/hastctl"
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#define HASTD_PORT 8457
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#define HASTD_LISTEN "tcp4://0.0.0.0:8457"
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#define HASTD_PIDFILE "/var/run/hastd.pid"
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/* Default extent size. */
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#define HAST_EXTENTSIZE 2097152
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/* Default maximum number of extents that are kept dirty. */
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#define HAST_KEEPDIRTY 64
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#define HAST_ADDRSIZE 1024
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#define HAST_TOKEN_SIZE 16
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struct hastd_config {
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/* Address to communicate with hastctl(8). */
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char hc_controladdr[HAST_ADDRSIZE];
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/* Protocol-specific data. */
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struct proto_conn *hc_controlconn;
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/* Address to listen on. */
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char hc_listenaddr[HAST_ADDRSIZE];
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/* Protocol-specific data. */
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struct proto_conn *hc_listenconn;
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/* List of resources. */
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TAILQ_HEAD(, hast_resource) hc_resources;
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};
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#define HAST_REPLICATION_FULLSYNC 0
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#define HAST_REPLICATION_MEMSYNC 1
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#define HAST_REPLICATION_ASYNC 2
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/*
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* Structure that describes single resource.
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*/
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struct hast_resource {
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/* Resource name. */
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char hr_name[NAME_MAX];
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/* Replication mode (HAST_REPLICATION_*). */
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int hr_replication;
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/* Provider name that will appear in /dev/hast/. */
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char hr_provname[NAME_MAX];
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/* Synchronization extent size. */
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int hr_extentsize;
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/* Maximum number of extents that are kept dirty. */
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int hr_keepdirty;
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/* Path to local component. */
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char hr_localpath[PATH_MAX];
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/* Descriptor to access local component. */
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int hr_localfd;
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/* Offset into local component. */
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off_t hr_localoff;
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/* Size of usable space. */
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off_t hr_datasize;
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/* Size of entire local provider. */
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off_t hr_local_mediasize;
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/* Sector size of local provider. */
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unsigned int hr_local_sectorsize;
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/* Descriptor for /dev/ggctl communication. */
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int hr_ggatefd;
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/* Unit number for ggate communication. */
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int hr_ggateunit;
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/* Address of the remote component. */
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char hr_remoteaddr[HAST_ADDRSIZE];
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/* Connection for incoming data. */
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struct proto_conn *hr_remotein;
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/* Connection for outgoing data. */
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struct proto_conn *hr_remoteout;
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/* Token to verify both in and out connection are coming from
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the same node (not necessarily from the same address). */
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unsigned char hr_token[HAST_TOKEN_SIZE];
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/* Resource unique identifier. */
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uint64_t hr_resuid;
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/* Primary's local modification count. */
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uint64_t hr_primary_localcnt;
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/* Primary's remote modification count. */
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uint64_t hr_primary_remotecnt;
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/* Secondary's local modification count. */
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uint64_t hr_secondary_localcnt;
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/* Secondary's remote modification count. */
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uint64_t hr_secondary_remotecnt;
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/* Synchronization source. */
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uint8_t hr_syncsrc;
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/* Resource role: HAST_ROLE_{INIT,PRIMARY,SECONDARY}. */
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int hr_role;
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/* Previous resource role: HAST_ROLE_{INIT,PRIMARY,SECONDARY}. */
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int hr_previous_role;
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/* PID of child worker process. 0 - no child. */
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pid_t hr_workerpid;
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/* Control connection between parent and child. */
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struct proto_conn *hr_ctrl;
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/* Activemap structure. */
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struct activemap *hr_amp;
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/* Locked used to synchronize access to hr_amp. */
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pthread_mutex_t hr_amp_lock;
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/* Next resource. */
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TAILQ_ENTRY(hast_resource) hr_next;
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};
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struct hastd_config *yy_config_parse(const char *config);
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void yy_config_free(struct hastd_config *config);
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void yyerror(const char *);
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int yylex(void);
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int yyparse(void);
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#endif /* !_HAST_H_ */
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