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
138 lines
3.4 KiB
C
138 lines
3.4 KiB
C
/*-
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* Copyright (c) 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/queue.h>
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#include <assert.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "rangelock.h"
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#define RANGELOCKS_MAGIC 0x94310c
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struct rangelocks {
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int rls_magic; /* Magic value. */
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TAILQ_HEAD(, rlock) rls_locks; /* List of locked ranges. */
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};
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struct rlock {
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off_t rl_start;
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off_t rl_end;
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TAILQ_ENTRY(rlock) rl_next;
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};
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int
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rangelock_init(struct rangelocks **rlsp)
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{
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struct rangelocks *rls;
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assert(rlsp != NULL);
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rls = malloc(sizeof(*rls));
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if (rls == NULL)
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return (-1);
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TAILQ_INIT(&rls->rls_locks);
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rls->rls_magic = RANGELOCKS_MAGIC;
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*rlsp = rls;
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return (0);
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}
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void
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rangelock_free(struct rangelocks *rls)
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{
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struct rlock *rl;
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assert(rls->rls_magic == RANGELOCKS_MAGIC);
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rls->rls_magic = 0;
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while ((rl = TAILQ_FIRST(&rls->rls_locks)) != NULL) {
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TAILQ_REMOVE(&rls->rls_locks, rl, rl_next);
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free(rl);
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}
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free(rls);
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}
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int
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rangelock_add(struct rangelocks *rls, off_t offset, off_t length)
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{
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struct rlock *rl;
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assert(rls->rls_magic == RANGELOCKS_MAGIC);
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rl = malloc(sizeof(*rl));
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if (rl == NULL)
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return (-1);
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rl->rl_start = offset;
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rl->rl_end = offset + length;
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TAILQ_INSERT_TAIL(&rls->rls_locks, rl, rl_next);
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return (0);
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}
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void
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rangelock_del(struct rangelocks *rls, off_t offset, off_t length)
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{
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struct rlock *rl;
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assert(rls->rls_magic == RANGELOCKS_MAGIC);
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TAILQ_FOREACH(rl, &rls->rls_locks, rl_next) {
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if (rl->rl_start == offset && rl->rl_end == offset + length)
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break;
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}
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assert(rl != NULL);
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TAILQ_REMOVE(&rls->rls_locks, rl, rl_next);
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free(rl);
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}
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bool
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rangelock_islocked(struct rangelocks *rls, off_t offset, off_t length)
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{
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struct rlock *rl;
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assert(rls->rls_magic == RANGELOCKS_MAGIC);
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TAILQ_FOREACH(rl, &rls->rls_locks, rl_next) {
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if (rl->rl_start >= offset && rl->rl_start < offset + length)
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break;
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else if (rl->rl_end > offset && rl->rl_end <= offset + length)
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break;
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else if (rl->rl_start < offset && rl->rl_end > offset + length)
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break;
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}
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return (rl != NULL);
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}
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