mm: factor out page cache page freeing into a separate function

Factor out page freeing from delete_from_page_cache() into a separate
function.  We will need to call the same when batching pagecache
deletion operations.

invalidate_complete_page2() and replace_page_cache_page() might want to
call this function as well however they currently don't seem to handle
THPs so it's unnecessary for them to take the hit of checking whether a
page is THP or not.

Link: http://lkml.kernel.org/r/20171010151937.26984-4-jack@suse.cz
Signed-off-by: Jan Kara <jack@suse.cz>
Acked-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/filemap.c b/mm/filemap.c
index 6eb4e32d99c8673562a880ab1cbf371519c83c50..ecf7565ff435778788a7f4b89dea8865f7323700 100644 (file)
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -254,6 +254,23 @@ void __delete_from_page_cache(struct page *page, void *shadow)
                account_page_cleaned(page, mapping, inode_to_wb(mapping->host));
 }
 
+static void page_cache_free_page(struct address_space *mapping,
+                               struct page *page)
+{
+       void (*freepage)(struct page *);
+
+       freepage = mapping->a_ops->freepage;
+       if (freepage)
+               freepage(page);
+
+       if (PageTransHuge(page) && !PageHuge(page)) {
+               page_ref_sub(page, HPAGE_PMD_NR);
+               VM_BUG_ON_PAGE(page_count(page) <= 0, page);
+       } else {
+               put_page(page);
+       }
+}
+
 /**
  * delete_from_page_cache - delete page from page cache
  * @page: the page which the kernel is trying to remove from page cache
@@ -266,25 +283,13 @@ void delete_from_page_cache(struct page *page)
 {
        struct address_space *mapping = page_mapping(page);
        unsigned long flags;
-       void (*freepage)(struct page *);
 
        BUG_ON(!PageLocked(page));
-
-       freepage = mapping->a_ops->freepage;
-
        spin_lock_irqsave(&mapping->tree_lock, flags);
        __delete_from_page_cache(page, NULL);
        spin_unlock_irqrestore(&mapping->tree_lock, flags);
 
-       if (freepage)
-               freepage(page);
-
-       if (PageTransHuge(page) && !PageHuge(page)) {
-               page_ref_sub(page, HPAGE_PMD_NR);
-               VM_BUG_ON_PAGE(page_count(page) <= 0, page);
-       } else {
-               put_page(page);
-       }
+       page_cache_free_page(mapping, page);
 }
 EXPORT_SYMBOL(delete_from_page_cache);