tree 752103db616696fd7ba3374948fac9ebdf462d9e
parent f1ac2502e19c59e996242d406fcc60e4c563e8ce
author Tejun Heo <tj@kernel.org> 1273946967 +0200
committer Jens Axboe <jens.axboe@oracle.com> 1274464862 +0200

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 <tj@kernel.org>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>