From: Tejun Heo Date: Sat, 15 May 2010 18:09:27 +0000 (+0200) Subject: buffer: make invalidate_bdev() drain all percpu LRU add caches X-Git-Tag: v2.6.35-rc1~442^2~15 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=fa4b9074cd8428958c2adf9dc0c831f46e27c193;p=platform%2Fkernel%2Flinux-3.10.git 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 --- diff --git a/fs/buffer.c b/fs/buffer.c index c9c266d..08e422d 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);