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gefs: remove epoch around chsend

this chsend epoch can cause deadlocks at shutdown,
and epoch bloat at other times; we don't access the
tree, so don't do it.

--- a/sys/src/cmd/gefs/fs.c

+++ b/sys/src/cmd/gefs/fs.c

@@ -3086,7 +3086,7 @@

 }

 void

-runtasks(int tid, void *)

+runtasks(int, void *)

 {

 	vlong now;

 	Mount *mnt;

@@ -3099,9 +3099,7 @@

 		sleep(5000);

 		if(agetl(&fs->rdonly))

 			continue;

-		epochstart(tid);

 		if(waserror()){

-			epochend(tid);

 			fprint(2, "task error: %s\n", errmsg());

 			continue;

 		}

@@ -3119,8 +3117,6 @@

 			for(i = 0; i < nelem(mnt->cron); i++)

 				cronsync(mnt->name, &mnt->cron[i], &tm, now);

 		}

-		epochend(tid);

-		epochclean();

 		poperror();

 	}

 }

--- a/sys/src/cmd/gefs/main.c

+++ b/sys/src/cmd/gefs/main.c

@@ -476,7 +476,7 @@

 	xlaunch(runcons, (void*)ctlfd, aincl(&fs->nworker, 1), "ctl");

 	xlaunch(runmutate, nil, aincl(&fs->nworker, 1), "mutate");

 	xlaunch(runsweep, nil, aincl(&fs->nworker, 1), "sweep");

-	xlaunch(runtasks, nil, aincl(&fs->nworker, 1), "tasks");

+	xlaunch(runtasks, nil, -1, "tasks");

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

 		xlaunch(runread, fs->rdchan[i], aincl(&fs->nworker, 1), "readio");

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

-- 

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