[v6,29/99] page cache: Convert filemap_range_has_page to XArray

Commit Message

Matthew Wilcox (Oracle) Jan. 17, 2018, 8:20 p.m. UTC

From: Matthew Wilcox <[e-mail]>

Instead of calling find_get_pages_range() and putting any reference,
just use xa_find() to look for a page in the right range.

Signed-off-by: Matthew Wilcox <[e-mail]>
---
 mm/filemap.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

Patch

diff --git a/mm/filemap.c b/mm/filemap.c
index 2536fcacb5bc..cd01f353cf6a 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -461,18 +461,11 @@  bool filemap_range_has_page(struct address_space *mapping,
 {
 	pgoff_t index = start_byte >> PAGE_SHIFT;
 	pgoff_t end = end_byte >> PAGE_SHIFT;
-	struct page *page;
 
 	if (end_byte < start_byte)
 		return false;
 
-	if (mapping->nrpages == 0)
-		return false;
-
-	if (!find_get_pages_range(mapping, &index, end, 1, &page))
-		return false;
-	put_page(page);
-	return true;
+	return xa_find(&mapping->pages, &index, end, XA_PRESENT);
 }
 EXPORT_SYMBOL(filemap_range_has_page);