mutex_unlock(&log->io_mutex);
}
+int r5l_handle_flush_request(struct r5l_log *log, struct bio *bio)
+{
+ if (!log)
+ return -ENODEV;
+ /*
+ * we flush log disk cache first, then write stripe data to raid disks.
+ * So if bio is finished, the log disk cache is flushed already. The
+ * recovery guarantees we can recovery the bio from log disk, so we
+ * don't need to flush again
+ */
+ if (bio->bi_iter.bi_size == 0) {
+ bio_endio(bio);
+ return 0;
+ }
+ bio->bi_rw &= ~REQ_FLUSH;
+ return -EAGAIN;
+}
+
/* This will run after log space is reclaimed */
static void r5l_run_no_space_stripes(struct r5l_log *log)
{
bool do_prepare;
if (unlikely(bi->bi_rw & REQ_FLUSH)) {
- md_flush_request(mddev, bi);
- return;
+ int ret = r5l_handle_flush_request(conf->log, bi);
+
+ if (ret == 0)
+ return;
+ if (ret == -ENODEV) {
+ md_flush_request(mddev, bi);
+ return;
+ }
+ /* ret == -EAGAIN, fallback */
}
md_write_start(mddev, bi);
extern void r5l_write_stripe_run(struct r5l_log *log);
extern void r5l_flush_stripe_to_raid(struct r5l_log *log);
extern void r5l_stripe_write_finished(struct stripe_head *sh);
+extern int r5l_handle_flush_request(struct r5l_log *log, struct bio *bio);
#endif