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gefs: don't skip syncing when fs has gone readonly

when exiting, we set the file system to read-only, so we
would skip flushing the last few IO operations; instead,
let's go ahead and flush them.

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

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

@@ -88,8 +88,6 @@

 	Tree *r;

 	int i;

-	if(agetl(&fs->rdonly))

-		return;

 	qlock(&fs->synclk);

 	if(waserror()){

 		fprint(2, "failed to sync: %s\n", errmsg());

@@ -2834,6 +2832,10 @@

 				for(i = 0; i < 4; i++){

 					epochwait();

 					epochclean();

+				}

+				if(waserror()){

+					fprint(2, "halt failed: %s\n", errmsg());

+					break;

 				}

 				sync(id);

 			}

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

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

@@ -1266,8 +1266,6 @@

 	Bptr bp;

 	assert(!canqlock(&fs->mutlk));

-	if(agetl(&fs->rdonly))

-		error(Erdonly);

 	sz = 0;

 	stablesort(msg, nmsg);

 	for(i = 0; i < nmsg; i++){

-- 

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