io_hash 358 drivers/md/bcache/bcache.h struct hlist_head io_hash[RECENT_IO + 1]; io_hash 372 drivers/md/bcache/request.c return &dc->io_hash[hash_64(k, RECENT_IO_BITS)]; io_hash 1324 drivers/md/bcache/super.c hlist_add_head(&io->hash, dc->io_hash + RECENT_IO);