linux-kernel - [PATCH v4 1/6] Introduce delete_from_page

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Message-Id: <f84b6238d52561ae291f548292f64cca338cf6e2.1296987110.git.minchan.kim@gmail.com>
Date:	Sun,  6 Feb 2011 19:48:00 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-mm <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Hugh Dickins <hughd@...gle.com>, Mel Gorman <mel@....ul.ie>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Christoph Hellwig <hch@...radead.org>
Subject: [PATCH v4 1/6] Introduce delete_from_page_cache

This function works as just wrapper remove_from_page_cache.
The difference is that it decreases page references in itself.
So caller have to make sure it has a page reference before calling.

This patch is ready for removing remove_from_page_cache.

Cc: Christoph Hellwig <hch@...radead.org>
Acked-by: Hugh Dickins <hughd@...gle.com>
Acked-by: Mel Gorman <mel@....ul.ie>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Reviewed-by: Johannes Weiner <hannes@...xchg.org>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Signed-off-by: Minchan Kim <minchan.kim@...il.com>
---
 include/linux/pagemap.h |    1 +
 mm/filemap.c            |   16 ++++++++++++++++
 2 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 26946ad..a943985 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -457,6 +457,7 @@ int add_to_page_cache_lru(struct page *page, struct address_space *mapping,
 				pgoff_t index, gfp_t gfp_mask);
 extern void remove_from_page_cache(struct page *page);
 extern void __remove_from_page_cache(struct page *page);
+extern void delete_from_page_cache(struct page *page);
 int replace_page_cache_page(struct page *old, struct page *new, gfp_t gfp_mask);
 
 /*
diff --git a/mm/filemap.c b/mm/filemap.c
index 3c89c96..f056d0c 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -166,6 +166,22 @@ void remove_from_page_cache(struct page *page)
 }
 EXPORT_SYMBOL(remove_from_page_cache);
 
+/**
+ * delete_from_page_cache - delete page from page cache
+ * @page: the page which the kernel is trying to remove from page cache
+ *
+ * This must be called only on pages that have
+ * been verified to be in the page cache and locked.
+ * It will never put the page into the free list,
+ * the caller has a reference on the page.
+ */
+void delete_from_page_cache(struct page *page)
+{
+	remove_from_page_cache(page);
+	page_cache_release(page);
+}
+EXPORT_SYMBOL(delete_from_page_cache);
+
 static int sync_page(void *word)
 {
 	struct address_space *mapping;
-- 
1.7.1

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