diff options
| author | Benjamin LaHaise <bcrl@kvack.org> | 2013-12-21 17:56:08 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-01-09 12:25:16 -0800 |
| commit | 2b9a704149ea2a1fe2679ffa2ed7c8d692e2b660 (patch) | |
| tree | 87fbb2edc722f70d58b04345c63b5ebb04f2d35d /include | |
| parent | 25c36e26d6a1021276330142f4c495235d6970de (diff) | |
aio/migratepages: make aio migrate pages sane
commit 8e321fefb0e60bae4e2a28d20fc4fa30758d27c6 upstream.
The arbitrary restriction on page counts offered by the core
migrate_page_move_mapping() code results in rather suspicious looking
fiddling with page reference counts in the aio_migratepage() operation.
To fix this, make migrate_page_move_mapping() take an extra_count parameter
that allows aio to tell the code about its own reference count on the page
being migrated.
While cleaning up aio_migratepage(), make it validate that the old page
being passed in is actually what aio_migratepage() expects to prevent
misbehaviour in the case of races.
Signed-off-by: Benjamin LaHaise <bcrl@kvack.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/migrate.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/migrate.h b/include/linux/migrate.h index 804651c6229..ee8b14ae4f3 100644 --- a/include/linux/migrate.h +++ b/include/linux/migrate.h @@ -55,7 +55,8 @@ extern int migrate_huge_page_move_mapping(struct address_space *mapping, struct page *newpage, struct page *page); extern int migrate_page_move_mapping(struct address_space *mapping, struct page *newpage, struct page *page, - struct buffer_head *head, enum migrate_mode mode); + struct buffer_head *head, enum migrate_mode mode, + int extra_count); #else static inline void putback_lru_pages(struct list_head *l) {} |