+#define FMINORBITS 20
+#define FMINORMASK ((1U << FMINORBITS) - 1)
+#define FMAJOR(dev) ((unsigned int) ((dev) >> FMINORBITS))
+#define FMINOR(dev) ((unsigned int) ((dev) & FMINORMASK))
+
+static void trace_add_open_close_event(struct thread_data *td, int fileno, enum file_log_act action)
+{
+ struct io_piece *ipo;
+
+ ipo = calloc(1, sizeof(*ipo));
+ init_ipo(ipo);
+
+ ipo->ddir = DDIR_INVAL;
+ ipo->fileno = fileno;
+ ipo->file_action = action;
+ flist_add_tail(&ipo->list, &td->io_log_list);
+}
+
+static int trace_add_file(struct thread_data *td, __u32 device)
+{
+ static unsigned int last_maj, last_min, last_fileno;
+ unsigned int maj = FMAJOR(device);
+ unsigned int min = FMINOR(device);
+ struct fio_file *f;
+ char dev[256];
+ unsigned int i;
+
+ if (last_maj == maj && last_min == min)
+ return last_fileno;
+
+ last_maj = maj;
+ last_min = min;
+
+ /*
+ * check for this file in our list
+ */
+ for_each_file(td, f, i)
+ if (f->major == maj && f->minor == min) {
+ last_fileno = f->fileno;
+ return last_fileno;
+ }
+
+ strcpy(dev, "/dev");
+ if (blktrace_lookup_device(td->o.replay_redirect, dev, maj, min)) {
+ int fileno;
+
+ if (td->o.replay_redirect)
+ dprint(FD_BLKTRACE, "device lookup: %d/%d\n overridden"
+ " with: %s\n", maj, min,
+ td->o.replay_redirect);
+ else
+ dprint(FD_BLKTRACE, "device lookup: %d/%d\n", maj, min);
+
+ dprint(FD_BLKTRACE, "add devices %s\n", dev);
+ fileno = add_file_exclusive(td, dev);
+ td->o.open_files++;
+ td->files[fileno]->major = maj;
+ td->files[fileno]->minor = min;
+ trace_add_open_close_event(td, fileno, FIO_LOG_OPEN_FILE);
+ last_fileno = fileno;
+ }
+
+ return last_fileno;
+}
+
+/*
+ * Store blk_io_trace data in an ipo for later retrieval.
+ */