shithub: gefs

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gefs: only sync when there's work to do

--- a/blk.c

+++ b/blk.c

@@ -1106,7 +1106,11 @@

 	Blk *b;

 	int i;

+	if(fs->rdonly)

+		return;

 	qlock(&fs->synclk);

+	if(!fs->snap.dirty)

+		return;

 	flushdlcache(0);

 	fs->syncing = fs->nsyncers;

 	for(i = 0; i < fs->nsyncers; i++){