mm/page_io.c: fix polled swap page in

swap_readpage() wants to do polling to bring in pages if asked to, but it doesn't mark the bio as being polled. Additionally, the looping around the blk_poll() check isn't correct - if we get a zero return, we should call io_schedule(), we can't just assume that the bio has completed. The regular bio->bi_private check should be used for that. Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]> Reviewed-by: Andrew Morton <[email protected]> Cc: Christoph Hellwig <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
chewitt · Jan 4, 2019 · b685a73 · b685a73
1 parent d499480
commit b685a73
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/mm/page_io.c b/mm/page_io.c
@@ -401,6 +401,8 @@ int swap_readpage(struct page *page, bool synchronous)
 	get_task_struct(current);
 	bio->bi_private = current;
 	bio_set_op_attrs(bio, REQ_OP_READ, 0);
+	if (synchronous)
+		bio->bi_opf |= REQ_HIPRI;
 	count_vm_event(PSWPIN);
 	bio_get(bio);
 	qc = submit_bio(bio);
@@ -410,7 +412,7 @@ int swap_readpage(struct page *page, bool synchronous)
 			break;
 
 		if (!blk_poll(disk->queue, qc, true))
-			break;
+			io_schedule();
 	}
 	__set_current_state(TASK_RUNNING);
 	bio_put(bio);