Messages in this thread Patch in this message | | | From | Tejun Heo <> | Subject | [PATCH 1/8] buffer: make invalidate_bdev() drain all percpu LRU add caches | Date | Sat, 15 May 2010 20:09:27 +0200 |
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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> --- fs/buffer.c | 1 + 1 files changed, 1 insertions(+), 0 deletions(-)
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); -- 1.6.4.2
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