/*
* Copyright 2000, International Business Machines Corporation and others.
* All Rights Reserved.
- *
+ *
* This software has been released under the terms of the IBM Public
* License. For details, see the LICENSE file in the top-level source
* directory or online at http://www.openafs.org/dl/license10.html
#include <afsconfig.h>
#include <afs/param.h>
-RCSID
- ("$Header$");
+#include <roken.h>
-#include <sys/types.h>
-#ifdef AFS_NT40_ENV
-#include <winsock2.h>
+#include <afs/opr.h>
+#ifdef AFS_PTHREAD_ENV
+# include <opr/lock.h>
#else
-#include <sys/file.h>
-#include <netinet/in.h>
+# include <opr/lockstub.h>
#endif
-#include <afs/afsutil.h>
#include <lock.h>
-#ifdef HAVE_STRING_H
-#include <string.h>
-#else
-#ifdef HAVE_STRINGS_H
-#include <strings.h>
-#endif
-#endif
-#include <rx/xdr.h>
#include <rx/rx.h>
#include <afs/afsutil.h>
-#include <time.h>
#define UBIK_INTERNALS
#include "ubik.h"
#include "ubik_int.h"
-/*
- General Ubik Goal:
- The goal is to provide reliable operation among N servers, such that any
- server can crash with the remaining servers continuing operation within a
- short period of time. While a *short* outage is acceptable, this time
- should be order of 3 minutes or less.
-
- Theory of operation:
-
- Note: SMALLTIME and BIGTIME are essentially the same time value, separated
- only by the clock skew, MAXSKEW. In general, if you are making guarantees
- for someone else, promise them no more than SMALLTIME seconds of whatever
- invariant you provide. If you are waiting to be sure some invariant is now
- *false*, wait at least BIGTIME seconds to be sure that SMALLTIME seconds
- has passed at the other site.
-
- Now, back to the design:
- One site in the collection is a special site, designated the *sync* site.
- The sync site sends periodic messages, which can be thought of as
- keep-alive messages. When a non-sync site hears from the sync site, it
- knows that it is getting updates for the next SMALLTIME seconds from that
- sync site.
-
- If a server does not hear from the sync site in SMALLTIME seconds, it
- determines that it no longer is getting updates, and thus refuses to give
- out potentially out-of-date data. If a sync site can not muster a majority
- of servers to agree that it is the sync site, then there is a possibility
- that a network partition has occurred, allowing another server to claim to
- be the sync site. Thus, any time that the sync site has not heard from a
- majority of the servers in the last SMALLTIME seconds, it voluntarily
- relinquishes its role as sync site.
-
- While attempting to nominate a new sync site, certain rules apply. First,
- a server can not reply "ok" (return 1 from ServBeacon) to two different
- hosts in less than BIGTIME seconds; this allows a server that has heard
- affirmative replies from a majority of the servers to know that no other
- server in the network has heard enough affirmative replies in the last
- BIGTIME seconds to become sync site, too. The variables ubik_lastYesTime
- and lastYesHost are used by all servers to keep track of which host they
- have last replied affirmatively to, when queried by a potential new sync
- site.
-
- Once a sync site has become a sync site, it periodically sends beacon
- messages with a parameter of 1, indicating that it already has determined
- it is supposed to be the sync site. The servers treat such a message as a
- guarantee that no other site will become sync site for the next SMALLTIME
- seconds. In the interim, these servers can answer a query concerning which
- site is the sync site without any communication with any server. The
- variables lastBeaconArrival and lastBeaconHost are used by all servers to
- keep track of which sync site has last contacted them.
-
- One complication occurs while nominating a new sync site: each site may be
- trying to nominate a different site (based on the value of lastYesHost),
- yet we must nominate the smallest host (under some order), to prevent this
- process from looping. The process could loop by having each server give
- one vote to another server, but with no server getting a majority of the
- votes. To avoid this, we try to withhold our votes for the server with the
- lowest internet address (an easy-to-generate order). To this effect, we
- keep track (in lowestTime and lowestHost) of the lowest server trying to
- become a sync site. We wait for this server unless there is already a sync
- site (indicated by ServBeacon's parameter being 1).
-*/
-
-afs_int32 ubik_debugFlag = 0; /* print out debugging messages? */
-
-/* these statics are used by all sites in nominating new sync sites */
-afs_int32 ubik_lastYesTime = 0; /* time we sent the last *yes* vote */
-static afs_uint32 lastYesHost = 0xffffffff; /* host to which we sent *yes* vote */
-/* Next is time sync site began this vote: guarantees sync site until this + SMALLTIME */
-static afs_int32 lastYesClaim = 0;
-static int lastYesState = 0; /* did last site we voted for claim to be sync site? */
-
-/* used to guarantee that nomination process doesn't loop */
-static afs_int32 lowestTime = 0;
-static afs_uint32 lowestHost = 0xffffffff;
-static afs_int32 syncTime = 0;
-static afs_int32 syncHost = 0;
-
-/* used to remember which dbase version is the one at the sync site (for non-sync sites */
-struct ubik_version ubik_dbVersion; /* sync site's dbase version */
-struct ubik_tid ubik_dbTid; /* sync site's tid, or 0 if none */
-
-/* decide if we should try to become sync site. The basic rule is that we
+/*! \file
+ * General Ubik Goal:
+ * The goal is to provide reliable operation among N servers, such that any
+ * server can crash with the remaining servers continuing operation within a
+ * short period of time. While a \b short outage is acceptable, this time
+ * should be order of 3 minutes or less.
+ *
+ * Theory of operation:
+ *
+ * Note: #SMALLTIME and #BIGTIME are essentially the same time value, separated
+ * only by the clock skew, #MAXSKEW. In general, if you are making guarantees
+ * for someone else, promise them no more than #SMALLTIME seconds of whatever
+ * invariant you provide. If you are waiting to be sure some invariant is now
+ * \b false, wait at least #BIGTIME seconds to be sure that #SMALLTIME seconds
+ * has passed at the other site.
+ *
+ * Now, back to the design:
+ * One site in the collection is a special site, designated the \b sync site.
+ * The sync site sends periodic messages, which can be thought of as
+ * keep-alive messages. When a non-sync site hears from the sync site, it
+ * knows that it is getting updates for the next #SMALLTIME seconds from that
+ * sync site.
+ *
+ * If a server does not hear from the sync site in #SMALLTIME seconds, it
+ * determines that it no longer is getting updates, and thus refuses to give
+ * out potentially out-of-date data. If a sync site can not muster a majority
+ * of servers to agree that it is the sync site, then there is a possibility
+ * that a network partition has occurred, allowing another server to claim to
+ * be the sync site. Thus, any time that the sync site has not heard from a
+ * majority of the servers in the last #SMALLTIME seconds, it voluntarily
+ * relinquishes its role as sync site.
+ *
+ * While attempting to nominate a new sync site, certain rules apply. First,
+ * a server can not reply "ok" (return 1 from ServBeacon) to two different
+ * hosts in less than #BIGTIME seconds; this allows a server that has heard
+ * affirmative replies from a majority of the servers to know that no other
+ * server in the network has heard enough affirmative replies in the last
+ * #BIGTIME seconds to become sync site, too. The variables #ubik_lastYesTime
+ * and #lastYesHost are used by all servers to keep track of which host they
+ * have last replied affirmatively to, when queried by a potential new sync
+ * site.
+ *
+ * Once a sync site has become a sync site, it periodically sends beacon
+ * messages with a parameter of 1, indicating that it already has determined
+ * it is supposed to be the sync site. The servers treat such a message as a
+ * guarantee that no other site will become sync site for the next #SMALLTIME
+ * seconds. In the interim, these servers can answer a query concerning which
+ * site is the sync site without any communication with any server. The
+ * variables #lastBeaconArrival and #lastBeaconHost are used by all servers to
+ * keep track of which sync site has last contacted them.
+ *
+ * One complication occurs while nominating a new sync site: each site may be
+ * trying to nominate a different site (based on the value of #lastYesHost),
+ * yet we must nominate the smallest host (under some order), to prevent this
+ * process from looping. The process could loop by having each server give
+ * one vote to another server, but with no server getting a majority of the
+ * votes. To avoid this, we try to withhold our votes for the server with the
+ * lowest internet address (an easy-to-generate order). To this effect, we
+ * keep track (in #lowestTime and #lowestHost) of the lowest server trying to
+ * become a sync site. We wait for this server unless there is already a sync
+ * site (indicated by ServBeacon's parameter being 1).
+ */
+
+afs_int32 ubik_debugFlag = 0; /*!< print out debugging messages? */
+
+struct vote_data vote_globals;
+
+
+/*!
+ * \brief Decide if we should try to become sync site.
+ *
+ * The basic rule is that we
* don't run if there is a valid sync site and it ain't us (we have to run if
* it is us, in order to keep our votes). If there is no sync site, then we
* want to run if we're the lowest numbered host running, otherwise we defer to
* the lowest host. However, if the lowest host hasn't been heard from for a
* while, then we start running again, in case he crashed.
*
- * This function returns true if we should run, and false otherwise.
+ * \return true if we should run, and false otherwise.
*/
int
uvote_ShouldIRun(void)
{
- register afs_int32 now;
+ afs_int32 now;
+ int code = 1; /* default to yes */
+ if (amIClone) {
+ return 0; /* if we cannot be the sync-site, do not ask for votes */
+ }
+
+ UBIK_VOTE_LOCK;
now = FT_ApproxTime();
- if (BIGTIME + ubik_lastYesTime < now)
- return 1; /* no valid guy even trying */
- if (lastYesState && lastYesHost != ubik_host[0])
- return 0; /* other guy is sync site, leave him alone */
- if (ntohl((afs_uint32) lastYesHost) < ntohl((afs_uint32) ubik_host[0]))
- return 0; /* if someone is valid and better than us, don't run */
- /* otherwise we should run */
- return 1;
+ if (BIGTIME + vote_globals.ubik_lastYesTime < now)
+ goto done;
+ if (vote_globals.lastYesState && vote_globals.lastYesHost != ubik_host[0]) {
+ code = 0; /* other guy is sync site, leave him alone */
+ goto done;
+ }
+ if (ntohl((afs_uint32)vote_globals.lastYesHost) < ntohl((afs_uint32)ubik_host[0])) {
+ code = 0; /* if someone is valid and better than us, don't run */
+ goto done;
+ }
+
+done:
+ UBIK_VOTE_UNLOCK;
+ return code;
}
-/* Return the current synchronization site, if any. Simple approach: if the
+/*!
+ * \brief Return the current synchronization site, if any.
+ *
+ * Simple approach: if the
* last guy we voted yes for claims to be the sync site, then we we're happy to
* use that guy for a sync site until the time his mandate expires. If the guy
* does not claim to be sync site, then, of course, there's none.
*
- * In addition, if we lost the sync, we set urecovery_syncSite to an invalid
+ * In addition, if we lost the sync, we set #urecovery_syncSite to an invalid
* value, indicating that we no longer know which version of the dbase is the
* one we should have. We'll get a new one when we next hear from the sync
* site.
*
- * This function returns 0 or currently valid sync site. It can return our own
+ * \return 0 or currently valid sync site. It can return our own
* address, if we're the sync site.
*/
afs_int32
uvote_GetSyncSite(void)
{
- register afs_int32 now;
- register afs_int32 code;
+ afs_int32 now;
+ afs_int32 code;
- if (!lastYesState)
+ UBIK_VOTE_LOCK;
+ if (!vote_globals.lastYesState)
code = 0;
else {
now = FT_ApproxTime();
- if (SMALLTIME + lastYesClaim < now)
+ if (SMALLTIME + vote_globals.lastYesClaim < now)
code = 0; /* last guy timed out */
else
- code = lastYesHost;
+ code = vote_globals.lastYesHost;
}
+ UBIK_VOTE_UNLOCK;
return code;
}
-/* called by the sync site to handle vote beacons; if aconn is null, this is a
- * local call; returns 0 or time whe the vote was sent. It returns 0 if we are
+/*!
+ * \brief called by the sync site to handle vote beacons; if aconn is null, this is a
+ * local call
+ *
+ * \returns 0 or time when the vote was sent. It returns 0 if we are
* not voting for this sync site, or the time we actually voted yes, if
* non-zero.
*/
afs_int32
-SVOTE_Beacon(register struct rx_call * rxcall, afs_int32 astate,
+SVOTE_Beacon(struct rx_call * rxcall, afs_int32 astate,
afs_int32 astart, struct ubik_version * avers,
struct ubik_tid * atid)
{
- register afs_int32 otherHost;
- register afs_int32 now;
+ afs_int32 otherHost;
+ afs_int32 now;
afs_int32 vote;
struct rx_connection *aconn;
struct rx_peer *rxp;
struct ubik_server *ts;
int isClone = 0;
+ char hoststr[16];
- now = FT_ApproxTime(); /* close to current time */
if (rxcall) { /* caller's host */
aconn = rx_ConnectionOf(rxcall);
rxp = rx_PeerOf(aconn);
/* This is the identifier that ubik uses. */
otherHost = ubikGetPrimaryInterfaceAddr(otherHost);
if (!otherHost) {
- ubik_dprint("Received beacon from unknown host %s\n",
- afs_inet_ntoa(rx_HostOf(rxp)));
+ ViceLog(5, ("Received beacon from unknown host %s\n",
+ afs_inet_ntoa_r(rx_HostOf(rxp), hoststr)));
return 0; /* I don't know about you: vote no */
}
for (ts = ubik_servers; ts; ts = ts->next) {
break;
}
if (!ts)
- ubik_dprint("Unknown host %x has sent a beacon\n", otherHost);
+ ViceLog(0, ("Unknown host %x has sent a beacon\n", otherHost));
if (ts && ts->isClone)
isClone = 1;
} else {
isClone = amIClone;
}
- ubik_dprint("Received beacon type %d from host %s\n", astate,
- afs_inet_ntoa(otherHost));
+ ViceLog(5, ("Received beacon type %d from host %s\n", astate,
+ afs_inet_ntoa_r(otherHost, hoststr)));
/* compute the lowest server we've heard from. We'll try to only vote for
* this dude if we don't already have a synchronization site. Also, don't
* lowestHost after BIGTIME seconds to limit the damage if this host
* actually crashes. Finally, we also count in this computation: don't
* pick someone else if we're even better!
- *
+ *
* Note that the test below must be <=, not <, so that we keep refreshing
* lowestTime. Otherwise it will look like we haven't heard from
* lowestHost in a while and another host could slip in. */
* lower than them, 'cause we know we're up. */
/* But do not consider clones for lowesHost since they never may become
* sync site */
+ UBIK_VOTE_LOCK;
+ now = FT_ApproxTime(); /* close to current time */
if (!isClone
- && (ntohl((afs_uint32) otherHost) <= ntohl((afs_uint32) lowestHost)
- || lowestTime + BIGTIME < now)) {
- lowestTime = now;
- lowestHost = otherHost;
+ && (ntohl((afs_uint32)otherHost) <= ntohl((afs_uint32)vote_globals.lowestHost)
+ || vote_globals.lowestTime + BIGTIME < now)) {
+ vote_globals.lowestTime = now;
+ vote_globals.lowestHost = otherHost;
}
/* why do we need this next check? Consider the case where each of two
* servers decides the other is lowestHost. Each stops sending beacons
* he's lowest, these loops don't occur. because if someone knows he's
* lowest, he will send out beacons telling others to vote for him. */
if (!amIClone
- && (ntohl((afs_uint32) ubik_host[0]) <= ntohl((afs_uint32) lowestHost)
- || lowestTime + BIGTIME < now)) {
- lowestTime = now;
- lowestHost = ubik_host[0];
+ && (ntohl((afs_uint32) ubik_host[0]) <= ntohl((afs_uint32)vote_globals.lowestHost)
+ || vote_globals.lowestTime + BIGTIME < now)) {
+ vote_globals.lowestTime = now;
+ vote_globals.lowestHost = ubik_host[0];
}
/* tell if we've heard from a sync site recently (even if we're not voting
* for this dude yet). After a while, time the guy out. */
if (astate) { /* this guy is a sync site */
- syncHost = otherHost;
- syncTime = now;
- } else if (syncTime + BIGTIME < now) {
- if (syncHost) {
- ubik_dprint
- ("Ubik: Lost contact with sync-site %d.%d.%d.%d (NOT in quorum)\n",
- ((syncHost >> 24) & 0xff), ((syncHost >> 16) & 0xff),
- ((syncHost >> 8) & 0xff), (syncHost & 0xff));
+ vote_globals.syncHost = otherHost;
+ vote_globals.syncTime = now;
+ } else if (vote_globals.syncTime + BIGTIME < now) {
+ if (vote_globals.syncHost) {
+ ViceLog(0, ("Ubik: Lost contact with sync-site %s (NOT in quorum)\n",
+ afs_inet_ntoa_r(vote_globals.syncHost, hoststr)));
}
- syncHost = 0;
+ vote_globals.syncHost = 0;
}
/* decide how to vote */
/* in here only if this guy doesn't claim to be a sync site */
/* lowestHost is also trying for our votes, then just say no. */
- if (ntohl(lowestHost) != ntohl(otherHost)) {
- return 0;
+ if (ntohl(vote_globals.lowestHost) != ntohl(otherHost)) {
+ goto done_zero;
}
/* someone else *is* a sync site, just say no */
- if (syncHost && syncHost != otherHost)
- return 0;
- } else /* fast startup if this is the only non-clone */ if (lastYesHost ==
- 0xffffffff
- && otherHost
- ==
- ubik_host[0])
- {
+ if (vote_globals.syncHost && vote_globals.syncHost != otherHost)
+ goto done_zero;
+ } else if (vote_globals.lastYesHost == 0xffffffff && otherHost == ubik_host[0]) {
+ /* fast startup if this is the only non-clone */
int i = 0;
for (ts = ubik_servers; ts; ts = ts->next) {
if (ts->addr[0] == otherHost)
i++;
}
if (!i)
- lastYesHost = otherHost;
+ vote_globals.lastYesHost = otherHost;
}
if (isClone)
- return 0; /* clone never can become sync site */
+ goto done_zero; /* clone never can become sync site */
/* Don't promise sync site support to more than one host every BIGTIME
* seconds. This is the heart of our invariants in this system. */
- if (ubik_lastYesTime + BIGTIME < now || otherHost == lastYesHost) {
- if ((ubik_lastYesTime + BIGTIME < now) || (otherHost != lastYesHost)
- || (lastYesState != astate)) {
+ if (vote_globals.ubik_lastYesTime + BIGTIME < now || otherHost == vote_globals.lastYesHost) {
+ if ((vote_globals.ubik_lastYesTime + BIGTIME < now) || (otherHost != vote_globals.lastYesHost)
+ || (vote_globals.lastYesState != astate)) {
/* A new vote or a change in the vote or changed quorum */
- ubik_dprint("Ubik: vote 'yes' for %s %s\n",
- afs_inet_ntoa(otherHost),
- (astate ? "(in quorum)" : "(NOT in quorum)"));
+ /* XXX This should be at loglevel 0, but the conditionals
+ * ought to be reworked first to prevent excessive logging.
+ */
+ ViceLog(5, ("Ubik: vote 'yes' for %s %s\n",
+ afs_inet_ntoa_r(otherHost, hoststr),
+ (astate ? "(in quorum)" : "(NOT in quorum)")));
}
vote = now; /* vote yes */
- ubik_lastYesTime = now; /* remember when we voted yes */
- lastYesClaim = astart; /* remember for computing when sync site expires */
- lastYesHost = otherHost; /* and who for */
- lastYesState = astate; /* remember if site is a sync site */
- ubik_dbVersion = *avers; /* resync value */
- ubik_dbTid = *atid; /* transaction id, if any, of active trans */
- urecovery_CheckTid(atid); /* check if current write trans needs aborted */
+ vote_globals.ubik_lastYesTime = now; /* remember when we voted yes */
+ vote_globals.lastYesClaim = astart; /* remember for computing when sync site expires */
+ vote_globals.lastYesHost = otherHost; /* and who for */
+ vote_globals.lastYesState = astate; /* remember if site is a sync site */
+ vote_globals.ubik_dbVersion = *avers; /* resync value */
+ vote_globals.ubik_dbTid = *atid; /* transaction id, if any, of active trans */
+ UBIK_VOTE_UNLOCK;
+ DBHOLD(ubik_dbase);
+ urecovery_CheckTid(atid, 0); /* check if current write trans needs aborted */
+ DBRELE(ubik_dbase);
+ } else {
+ UBIK_VOTE_UNLOCK;
}
return vote;
+done_zero:
+ UBIK_VOTE_UNLOCK;
+ return 0;
}
-/* handle per-server debug command, where 0 is the first server. Basic network
- debugging hooks. */
+/*!
+ * \brief Handle per-server debug command, where 0 is the first server.
+ *
+ * Basic network debugging hooks.
+ */
afs_int32
SVOTE_SDebug(struct rx_call * rxcall, afs_int32 awhich,
- register struct ubik_sdebug * aparm)
+ struct ubik_sdebug * aparm)
{
afs_int32 code, isClone;
code = SVOTE_XSDebug(rxcall, awhich, aparm, &isClone);
afs_int32
SVOTE_XSDebug(struct rx_call * rxcall, afs_int32 awhich,
- register struct ubik_sdebug * aparm, afs_int32 * isclone)
+ struct ubik_sdebug * aparm, afs_int32 * isclone)
{
- register struct ubik_server *ts;
- register int i;
+ struct ubik_server *ts;
+ int i;
for (ts = ubik_servers; ts; ts = ts->next) {
if (awhich-- == 0) {
/* we're done */
}
afs_int32
-SVOTE_XDebug(struct rx_call * rxcall, register struct ubik_debug * aparm,
+SVOTE_XDebug(struct rx_call * rxcall, struct ubik_debug * aparm,
afs_int32 * isclone)
{
afs_int32 code;
return code;
}
-/* handle basic network debug command. This is the global state dumper */
+/*!
+ * \brief Handle basic network debug command. This is the global state dumper.
+ */
afs_int32
-SVOTE_Debug(struct rx_call * rxcall, register struct ubik_debug * aparm)
+SVOTE_Debug(struct rx_call * rxcall, struct ubik_debug * aparm)
{
int i;
/* fill in the basic debug structure. Note the the RPC protocol transfers,
* integers in host order. */
+ memset(aparm, 0, sizeof(*aparm));
aparm->now = FT_ApproxTime();
- aparm->lastYesTime = ubik_lastYesTime;
- aparm->lastYesHost = ntohl(lastYesHost);
- aparm->lastYesState = lastYesState;
- aparm->lastYesClaim = lastYesClaim;
- aparm->lowestHost = ntohl(lowestHost);
- aparm->lowestTime = lowestTime;
- aparm->syncHost = ntohl(syncHost);
- aparm->syncTime = syncTime;
+ aparm->lastYesTime = vote_globals.ubik_lastYesTime;
+ aparm->lastYesHost = ntohl(vote_globals.lastYesHost);
+ aparm->lastYesState = vote_globals.lastYesState;
+ aparm->lastYesClaim = vote_globals.lastYesClaim;
+ aparm->lowestHost = ntohl(vote_globals.lowestHost);
+ aparm->lowestTime = vote_globals.lowestTime;
+ aparm->syncHost = ntohl(vote_globals.syncHost);
+ aparm->syncTime = vote_globals.syncTime;
+ memcpy(&aparm->syncVersion, &vote_globals.ubik_dbVersion, sizeof(struct ubik_version));
+ memcpy(&aparm->syncTid, &vote_globals.ubik_dbTid, sizeof(struct ubik_tid));
/* fill in all interface addresses of myself in hostbyte order */
for (i = 0; i < UBIK_MAX_INTERFACE_ADDR; i++)
aparm->interfaceAddr[i] = ntohl(ubik_host[i]);
- aparm->amSyncSite = ubik_amSyncSite;
+ aparm->amSyncSite = beacon_globals.ubik_amSyncSite;
ubeacon_Debug(aparm);
udisk_Debug(aparm);
ulock_Debug(aparm);
- /* Get the recovery state. The label of the database may not have
+ /* Get the recovery state. The label of the database may not have
* been written yet but set the flag so udebug behavior remains.
* Defect 9477.
*/
&& (urecovery_state & UBIK_RECHAVEDB)) {
aparm->recoveryState |= UBIK_RECLABELDB;
}
- memcpy(&aparm->syncVersion, &ubik_dbVersion, sizeof(struct ubik_version));
- memcpy(&aparm->syncTid, &ubik_dbTid, sizeof(struct ubik_tid));
- aparm->activeWrite = (ubik_dbase->flags & DBWRITING);
+ aparm->activeWrite = (ubik_dbase->dbFlags & DBWRITING);
aparm->tidCounter = ubik_dbase->tidCounter;
if (ubik_currentTrans) {
aparm->currentTrans = 1;
- if (ubik_currentTrans->type == UBIK_WRITETRANS)
- aparm->writeTrans = 1;
- else
- aparm->writeTrans = 0;
+ aparm->writeTrans = 1;
} else {
aparm->currentTrans = 0;
}
- aparm->epochTime = ubik_epochTime;
+ aparm->epochTime = version_globals.ubik_epochTime;
return 0;
}
afs_int32
SVOTE_SDebugOld(struct rx_call * rxcall, afs_int32 awhich,
- register struct ubik_sdebug_old * aparm)
+ struct ubik_sdebug_old * aparm)
{
- register struct ubik_server *ts;
+ struct ubik_server *ts;
for (ts = ubik_servers; ts; ts = ts->next) {
if (awhich-- == 0) {
}
-/* handle basic network debug command. This is the global state dumper */
+/*!
+ * \brief Handle basic network debug command. This is the global state dumper.
+ */
afs_int32
SVOTE_DebugOld(struct rx_call * rxcall,
- register struct ubik_debug_old * aparm)
+ struct ubik_debug_old * aparm)
{
/* fill in the basic debug structure. Note the the RPC protocol transfers,
* integers in host order. */
aparm->now = FT_ApproxTime();
- aparm->lastYesTime = ubik_lastYesTime;
- aparm->lastYesHost = ntohl(lastYesHost);
- aparm->lastYesState = lastYesState;
- aparm->lastYesClaim = lastYesClaim;
- aparm->lowestHost = ntohl(lowestHost);
- aparm->lowestTime = lowestTime;
- aparm->syncHost = ntohl(syncHost);
- aparm->syncTime = syncTime;
-
- aparm->amSyncSite = ubik_amSyncSite;
- ubeacon_Debug(aparm);
+ aparm->lastYesTime = vote_globals.ubik_lastYesTime;
+ aparm->lastYesHost = ntohl(vote_globals.lastYesHost);
+ aparm->lastYesState = vote_globals.lastYesState;
+ aparm->lastYesClaim = vote_globals.lastYesClaim;
+ aparm->lowestHost = ntohl(vote_globals.lowestHost);
+ aparm->lowestTime = vote_globals.lowestTime;
+ aparm->syncHost = ntohl(vote_globals.syncHost);
+ aparm->syncTime = vote_globals.syncTime;
+ memcpy(&aparm->syncVersion, &vote_globals.ubik_dbVersion, sizeof(struct ubik_version));
+ memcpy(&aparm->syncTid, &vote_globals.ubik_dbTid, sizeof(struct ubik_tid));
- udisk_Debug(aparm);
+ aparm->amSyncSite = beacon_globals.ubik_amSyncSite;
+ ubeacon_Debug((ubik_debug *)aparm);
- ulock_Debug(aparm);
+ udisk_Debug((ubik_debug *)aparm);
- /* Get the recovery state. The label of the database may not have
+ ulock_Debug((ubik_debug *)aparm);
+
+ /* Get the recovery state. The label of the database may not have
* been written yet but set the flag so udebug behavior remains.
* Defect 9477.
*/
&& (urecovery_state & UBIK_RECHAVEDB)) {
aparm->recoveryState |= UBIK_RECLABELDB;
}
- memcpy(&aparm->syncVersion, &ubik_dbVersion, sizeof(struct ubik_version));
- memcpy(&aparm->syncTid, &ubik_dbTid, sizeof(struct ubik_tid));
- aparm->activeWrite = (ubik_dbase->flags & DBWRITING);
+ aparm->activeWrite = (ubik_dbase->dbFlags & DBWRITING);
aparm->tidCounter = ubik_dbase->tidCounter;
if (ubik_currentTrans) {
aparm->currentTrans = 1;
- if (ubik_currentTrans->type == UBIK_WRITETRANS)
- aparm->writeTrans = 1;
- else
- aparm->writeTrans = 0;
+ aparm->writeTrans = 1;
} else {
aparm->currentTrans = 0;
}
- aparm->epochTime = ubik_epochTime;
+ aparm->epochTime = version_globals.ubik_epochTime;
return 0;
}
-/* get the sync site; called by remote servers to find where they should go */
+/*!
+ * \brief Get the sync site; called by remote servers to find where they should go.
+ */
afs_int32
-SVOTE_GetSyncSite(register struct rx_call * rxcall,
- register afs_int32 * ahost)
+SVOTE_GetSyncSite(struct rx_call * rxcall,
+ afs_int32 * ahost)
{
- register afs_int32 temp;
+ afs_int32 temp;
temp = uvote_GetSyncSite();
*ahost = ntohl(temp);
return 0;
}
+/*!
+ * \brief Called once/run to init the vote module
+ */
int
-ubik_dprint(char *a, char *b, char *c, char *d, char *e, char *f, char *g,
- char *h)
+uvote_Init(void)
{
- ViceLog(5, (a, b, c, d, e, f, g, h));
+ UBIK_VOTE_LOCK;
+ /* pretend we just voted for someone else, since we just restarted */
+ vote_globals.ubik_lastYesTime = FT_ApproxTime();
+
+ /* Initialize globals */
+ vote_globals.lastYesHost = 0xffffffff;
+ vote_globals.lastYesClaim = 0;
+ vote_globals.lastYesState = 0;
+ vote_globals.lowestTime = 0;
+ vote_globals.lowestHost = 0xffffffff;
+ vote_globals.syncTime = 0;
+ vote_globals.syncHost = 0;
+ UBIK_VOTE_UNLOCK;
+
+ return 0;
}
+void
+uvote_set_dbVersion(struct ubik_version version) {
+ UBIK_VOTE_LOCK;
+ vote_globals.ubik_dbVersion = version;
+ UBIK_VOTE_UNLOCK;
+}
+
+/* Compare given version to current DB version. Return true if equal. */
int
-ubik_print(char *a, char *b, char *c, char *d, char *e, char *f, char *g,
- char *h)
-{
- ViceLog(0, (a, b, c, d, e, f, g, h));
+uvote_eq_dbVersion(struct ubik_version version) {
+ int ret = 0;
+
+ UBIK_VOTE_LOCK;
+ if (vote_globals.ubik_dbVersion.epoch == version.epoch && vote_globals.ubik_dbVersion.counter == version.counter) {
+ ret = 1;
+ }
+ UBIK_VOTE_UNLOCK;
+ return ret;
}
-/* called once/run to init the vote module */
+/*!
+ * \brief Check if there is a sync site and whether we have a given db version
+ *
+ * \return 1 if there is a valid sync site, and the given db version matches the sync site's
+ */
+
int
-uvote_Init(void)
+uvote_HaveSyncAndVersion(struct ubik_version version)
{
- /* pretend we just voted for someone else, since we just restarted */
- ubik_lastYesTime = FT_ApproxTime();
- return 0;
+ afs_int32 now;
+ int code;
+
+ UBIK_VOTE_LOCK;
+ now = FT_ApproxTime();
+ if (!vote_globals.lastYesState || (SMALLTIME + vote_globals.lastYesClaim < now) ||
+ vote_globals.ubik_dbVersion.epoch != version.epoch ||
+ vote_globals.ubik_dbVersion.counter != version.counter)
+ code = 0;
+ else
+ code = 1;
+ UBIK_VOTE_UNLOCK;
+ return code;
}
git://git.openafs.org / openafs.git / blobdiff