[v6,29/99] page cache: Convert filemap_range_has_page to XArray
From: Matthew Wilcox <willy@infradead.org>
Date: 2018-01-17 20:20:53
Also in:
cgroups, intel-gfx, linux-f2fs-devel, linux-fsdevel, linux-iommu, linux-mm, linux-remoteproc, linux-s390, linux-sh, linux-xfs, lkml
Subsystem:
memory management, page cache, the rest · Maintainers:
Andrew Morton, Matthew Wilcox, Jan Kara, Linus Torvalds
From: Matthew Wilcox <redacted> 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 <redacted> --- mm/filemap.c | 9 +-------- 1 file changed, 1 insertion(+), 8 deletions(-)
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);