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mbsync
mirror of https://git.code.sf.net/p/isync/isync
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don't rewrite state gratuitously 

delay the creation of the new state and journal until there is actually
something interesting to write. this saves some cpu cycles and prolongs
ssd life a whee bit.
1.4
Oswald Buddenhagen 5 years ago
parent
0e5046e14a
commit
68a412115a
2 changed files with 53 additions and 23 deletions
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  1. 5
      src/run-tests.pl
  2. 59
      src/sync.c

5
src/run-tests.pl
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@ -702,7 +702,7 @@ sub test($$$@)
rmtree "far";
my $njl = (@nj - 1) * 2;
for (my $l = 2; $l < $njl; $l++) {
for (my $l = 1; $l <= $njl; $l++) {
mkchan($$sx[0], $$sx[1], @{ $$sx[2] });
my ($nxc, @nret) = runsync("-J$l", "4-interrupt.log");
@ -721,7 +721,8 @@ sub test($$$@)
print "Options:\n";
print " [ ".join(", ", map('"'.qm($_).'"', @sfx))." ]\n";
my @nnj = readfile("near/.mbsyncstate.journal");
print "Journal:\n".join("", @nnj[0..($l / 2 - 1)])."-------\n".join("", @nnj[($l / 2)..$#nnj])."\n";
my $ln = int($l / 2);
print "Journal:\n".join("", @nnj[0..$ln])."-------\n".join("", @nnj[($ln + 1)..$#nnj])."\n";
print "Full journal:\n".join("", @nj)."\n";
if (!$nxc) {
print "Expected result:\n";

59
src/sync.c
Unescape View File

@ -39,6 +39,8 @@
# define fdatasync fsync
#endif
#define JOURNAL_VERSION "4"
channel_conf_t global_conf;
channel_conf_t *channels;
group_conf_t *groups;
@ -167,10 +169,12 @@ typedef struct {
uint ref_count, nsrecs, opts[2];
uint new_pending[2], flags_pending[2], trash_pending[2];
uint maxuid[2]; // highest UID that was already propagated
uint oldmaxuid[2]; // highest UID that was already propagated before this run
uint uidval[2]; // UID validity value
uint newuidval[2]; // UID validity obtained from driver
uint finduid[2]; // TUID lookup makes sense only for UIDs >= this
uint maxxfuid; // highest expired UID on far side
uint oldmaxxfuid; // highest expired UID on far side before this run
uchar good_flags[2], bad_flags[2];
} sync_vars_t;
@ -218,6 +222,15 @@ static int check_cancel( sync_vars_t *svars );
#define ST_SENDING_NEW (1<<15)
static void
create_state( sync_vars_t *svars )
{
if (!(svars->nfp = fopen( svars->nname, "w" ))) {
sys_error( "Error: cannot create new sync state %s", svars->nname );
exit( 1 );
}
}
static void ATTR_PRINTFLIKE(2, 3)
jFprintf( sync_vars_t *svars, const char *msg, ... )
{
@ -225,6 +238,16 @@ jFprintf( sync_vars_t *svars, const char *msg, ... )
if (JLimit && !--JLimit)
exit( 101 );
if (!svars->jfp) {
create_state( svars );
if (!(svars->jfp = fopen( svars->jname, svars->replayed ? "a" : "w" ))) {
sys_error( "Error: cannot create journal %s", svars->jname );
exit( 1 );
}
setlinebuf( svars->jfp );
if (!svars->replayed)
Fprintf( svars->jfp, JOURNAL_VERSION "\n" );
}
va_start( va, msg );
vFprintf( svars->jfp, msg, va );
va_end( va );
@ -625,8 +648,6 @@ clean_strdup( const char *s )
}
#define JOURNAL_VERSION "4"
static int
prepare_state( sync_vars_t *svars )
{
@ -704,6 +725,12 @@ save_state( sync_vars_t *svars )
sync_rec_t *srec;
char fbuf[16]; /* enlarge when support for keywords is added */
// If no change was made, the state is also unmodified.
if (!svars->jfp && !svars->replayed)
return;
if (!svars->nfp)
create_state( svars );
Fprintf( svars->nfp,
"FarUidValidity %u\nNearUidValidity %u\nMaxPulledUid %u\nMaxPushedUid %u\n",
svars->uidval[F], svars->uidval[N], svars->maxuid[F], svars->maxuid[N] );
@ -719,6 +746,7 @@ save_state( sync_vars_t *svars )
}
Fclose( svars->nfp, 1 );
if (svars->jfp)
Fclose( svars->jfp, 0 );
if (!(DFlags & KEEPJOURNAL)) {
/* order is important! */
@ -1234,18 +1262,6 @@ box_opened2( sync_vars_t *svars, int t )
if (!lock_state( svars ))
goto bail;
if (!(svars->nfp = fopen( svars->nname, "w" ))) {
sys_error( "Error: cannot create new sync state %s", svars->nname );
goto bail;
}
if (!(svars->jfp = fopen( svars->jname, "a" ))) {
sys_error( "Error: cannot create journal %s", svars->jname );
fclose( svars->nfp );
goto bail;
}
setlinebuf( svars->jfp );
if (!svars->replayed)
jFprintf( svars, JOURNAL_VERSION "\n" );
opts[F] = opts[N] = 0;
if (fails)
@ -1495,10 +1511,16 @@ box_loaded( int sts, message_t *msgs, int total_msgs, int recent_msgs, void *aux
JLOG( "| %u %u", (svars->uidval[F], svars->uidval[N]), "new UIDVALIDITYs" );
}
svars->oldmaxuid[F] = svars->maxuid[F];
svars->oldmaxuid[N] = svars->maxuid[N];
svars->oldmaxxfuid = svars->maxxfuid;
info( "Synchronizing...\n" );
for (t = 0; t < 2; t++)
svars->good_flags[t] = (uchar)svars->drv[t]->get_supported_flags( svars->ctx[t] );
int any_new[2] = { 0, 0 };
debug( "synchronizing old entries\n" );
for (srec = svars->srecs; srec; srec = srec->next) {
if (srec->status & S_DEAD)
@ -1643,6 +1665,7 @@ box_loaded( int sts, message_t *msgs, int total_msgs, int recent_msgs, void *aux
srec->status = S_PENDING;
JLOG( "~ %u %u %u", (srec->uid[F], srec->uid[N], srec->status), "was too big" );
}
any_new[t] = 1;
} else {
if (srec->status == S_SKIPPED) {
debug( "-> still too big\n" );
@ -1825,12 +1848,16 @@ box_loaded( int sts, message_t *msgs, int total_msgs, int recent_msgs, void *aux
}
debug( "propagating new messages\n" );
if (UseFSync)
if (UseFSync && svars->jfp)
fdatasync( fileno( svars->jfp ) );
for (t = 0; t < 2; t++) {
if (any_new[t]) {
svars->finduid[t] = svars->drv[t]->get_uidnext( svars->ctx[t] );
JLOG( "F %d %u", (t, svars->finduid[t]), "save UIDNEXT of %s", str_fn[t] );
svars->new_msgs[t] = svars->msgs[1-t];
} else {
svars->state[t] |= ST_SENT_NEW;
}
msgs_copied( svars, t );
if (check_cancel( svars ))
goto out;
@ -2164,6 +2191,7 @@ box_closed_p2( sync_vars_t *svars, int t )
// ensure that all pending messages are still loaded next time in case
// of interruption - in particular skipping big messages would otherwise
// up the limit too early.
if (svars->maxuid[t] != svars->oldmaxuid[t])
JLOG( "N %d %u", (t, svars->maxuid[t]), "up maxuid of %s", str_fn[t] );
}
@ -2191,6 +2219,7 @@ box_closed_p2( sync_vars_t *svars, int t )
// This is just an optimization, so it needs no journaling of intermediate states.
// However, doing it before the entry purge would require ensuring that the
// exception list includes all relevant messages.
if (svars->maxxfuid != svars->oldmaxxfuid)
JLOG( "! %u", svars->maxxfuid, "max expired UID on far side" );
save_state( svars );

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