bcachefs: propagate BCH_WRITE_CACHED

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/io.c

@@ -425,6 +425,7 @@ static void init_append_extent(struct bch_write_op *op,
 			       struct bch_extent_crc_unpacked crc)
 {
 	struct bkey_i_extent *e = bkey_extent_init(op->insert_keys.top);
+	struct bch_extent_ptr *ptr;
 
 	op->pos.offset += crc.uncompressed_size;
 	e->k.p		= op->pos;
@@ -438,6 +439,10 @@ static void init_append_extent(struct bch_write_op *op,
 
 	bch2_alloc_sectors_append_ptrs(op->c, wp, &e->k_i, crc.compressed_size);
 
+	if (op->flags & BCH_WRITE_CACHED)
+		extent_for_each_ptr(extent_i_to_s(e), ptr)
+			ptr->cached = true;
+
 	bch2_keylist_push(&op->insert_keys);
 }