[RFC PATCH 07/79] mm/page: add helpers to find mapping give a page and buffer head
From: <hidden>
Date: 2018-04-04 19:17:54
Also in:
linux-fsdevel, linux-mm, lkml
Subsystem:
the rest · Maintainer:
Linus Torvalds
From: Jérôme Glisse <redacted> For now this simply use exist page_mapping() inline. Latter it will use buffer head pointer as a key to lookup mapping for write protected page. Signed-off-by: Jérôme Glisse <redacted> Cc: linux-mm@kvack.org CC: Andrew Morton <akpm@linux-foundation.org> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: linux-fsdevel@vger.kernel.org Cc: Tejun Heo <tj@kernel.org> Cc: Jan Kara <jack@suse.cz> Cc: Josef Bacik <redacted> Cc: Mel Gorman <redacted> --- include/linux/mm-page.h | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/include/linux/mm-page.h b/include/linux/mm-page.h
index 2981db45eeef..647a8a8cf9ba 100644
--- a/include/linux/mm-page.h
+++ b/include/linux/mm-page.h@@ -132,5 +132,17 @@ static inline unsigned long _page_file_offset(struct page *page, return page->index << PAGE_SHIFT; } +/* + * fs_page_mapping_get_with_bh() - page mapping knowing buffer_head + * @page: page struct pointer for which we want the mapping + * @bh: buffer_head associated with the page for the mapping + * Returns: page mapping for the given buffer head + */ +static inline struct address_space *fs_page_mapping_get_with_bh( + struct page *page, struct buffer_head *bh) +{ + return page_mapping(page); +} + #endif /* MM_PAGE_H */ #endif /* DOT_NOT_INCLUDE___INSIDE_MM */
--
2.14.3