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hjfs: check: check a block if its ref count is _not_ zero. Also check all the ref counts of blocks of a directory and clean up messages

--- a/sys/src/cmd/hjfs/check.c

+++ b/sys/src/cmd/hjfs/check.c

@@ -16,14 +16,16 @@

 	d = getdent(l, b);

 	for(i = 0; i < d->size; i++){

 		if(getblk(fsmain, l, b, i, &r, GBREAD) <= 0) {

-			dprint("hjfs: directory %s in block %ulld at index %d has a bad block reference at %ulld\n", d->name, l->blk, l->deind, i);

+			dprint("hjfs: directory in block %ulld at index %d has a bad block %ulld at directory index %ulld\n", l->blk, l->deind, r, i);

 			continue;

 		}

 		c = getbuf(fsmain->d, r, TDENTRY, 0);

 		if(c == nil) {

-			dprint("hjfs: directory %s in block %ulld at index %d has a block %ulld that is not a directory entry\n", d->name, l->blk, l->deind, i);

+			dprint("hjfs: directory in block %ulld at index %d has a block %ulld at directory index %ulld that is not a directory entry\n", l->blk, l->deind, r, i);

 			continue;

 		}

+		if(chref(fsmain, r, 0) == 0)

+			dprint("hjfs: directory in block %ulld at index %d has a block %ulld at index %ulld whose reference count is 0");

 	}

 }

--- a/sys/src/cmd/hjfs/cons.c

+++ b/sys/src/cmd/hjfs/cons.c

@@ -127,7 +127,7 @@

 			continue;

 		}

 		for(j = 0; j < REFPERBLK; j++, blk++)

-			if(b->refs[j] == 0)

+			if(b->refs[j] > 0)

 				checkblk(blk);

 		putbuf(b);

 	}