From fa4b9074cd8428958c2adf9dc0c831f46e27c193 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Sat, 15 May 2010 20:09:27 +0200 Subject: [PATCH] buffer: make invalidate_bdev() drain all percpu LRU add caches invalidate_bdev() should release all page cache pages which are clean and not being used; however, if some pages are still in the percpu LRU add caches on other cpus, those pages are considered in used and don't get released. Fix it by calling lru_add_drain_all() before trying to invalidate pages. This problem was discovered while testing block automatic native capacity unlocking. Null pages which were read before automatic unlocking didn't get released by invalidate_bdev() and ended up interfering with partition scan after unlocking. Signed-off-by: Tejun Heo Acked-by: David S. Miller Signed-off-by: Jens Axboe --- fs/buffer.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/buffer.c b/fs/buffer.c index c9c266db0624..08e422d56996 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -275,6 +275,7 @@ void invalidate_bdev(struct block_device *bdev) return; invalidate_bh_lrus(); + lru_add_drain_all(); /* make sure all lru add caches are flushed */ invalidate_mapping_pages(mapping, 0, -1); } EXPORT_SYMBOL(invalidate_bdev); -- 2.20.1