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Commit fa4b9074 authored by Tejun Heo's avatar Tejun Heo Committed by Jens Axboe
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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: default avatarTejun Heo <tj@kernel.org>
Acked-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
parent f1ac2502

fs/buffer.c

+1 −0
Original line number Diff line number Diff line
@@ -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);