shithub: gefs

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blk: fix excessive cleverness in sync

we're not throwing a ton of syncs down the channels,
so just take the damn lock instead of messing with
atomics.

--- a/blk.c

+++ b/blk.c

@@ -985,11 +985,10 @@

 		while(q.nheap < q.heapsz){

 			b = chrecv(c, q.nheap == 0);

 			if(b == &magic){

-				if(adec(&fs->syncing) == 0){

-					qlock(&fs->synclk);

+				qlock(&fs->synclk);

+				if(--fs->syncing == 0)

 					rwakeupall(&fs->syncrz);

-					qunlock(&fs->synclk);

-				}

+				qunlock(&fs->synclk);

 				continue;

 			}				

 			if(b != nil)