lightnvm: pblk: remove target using async. I/Os

When removing a pblk instance, pad the current line using asynchronous
I/O. This reduces the removal time from ~1 minute in the worst case to a
couple of seconds.

Signed-off-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <matias@cnexlabs.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c
index b3fc310aa51c..025d8fe52154 100644
--- a/drivers/lightnvm/pblk-init.c
+++ b/drivers/lightnvm/pblk-init.c
@@ -841,6 +841,15 @@ static int pblk_writer_init(struct pblk *pblk)
 
 static void pblk_writer_stop(struct pblk *pblk)
 {
+        /* The pipeline must be stopped and the write buffer emptied before the
+         * write thread is stopped
+         */
+        WARN(pblk_rb_read_count(&pblk->rwb),
+                        "Stopping not fully persisted write buffer\n");
+
+        WARN(pblk_rb_sync_count(&pblk->rwb),
+                        "Stopping not fully synced write buffer\n");
+
         if (pblk->writer_ts)
                 kthread_stop(pblk->writer_ts);
         del_timer(&pblk->wtimer);