Messages in this thread Patch in this message | | | From | Minchan Kim <> | Subject | [PATCH v3 1/7] Introduce delete_from_page_cache | Date | Tue, 11 Jan 2011 14:22:05 +0900 |
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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@infradead.org> Acked-by: Hugh Dickins <hughd@google.com> Acked-by: Mel Gorman <mel@csn.ul.ie> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Reviewed-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Minchan Kim <minchan.kim@gmail.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 9c66e99..7a1cb49 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); /* * Like add_to_page_cache_locked, but used to add newly allocated pages: diff --git a/mm/filemap.c b/mm/filemap.c index 095c393..cf9bbf2 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; -- 1.7.0.4
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