Thread (67 messages) 67 messages, 4 authors, 2017-02-13

[PATCHv6 24/37] ext4: make ext4_mpage_readpages() hugepage-aware

From: Kirill A. Shutemov <hidden>
Date: 2017-01-26 11:58:06
Also in: linux-ext4, linux-fsdevel, linux-mm, lkml
Subsystem: ext4 file system, filesystems (vfs and infrastructure), the rest · Maintainers: "Theodore Ts'o", Alexander Viro, Christian Brauner, Linus Torvalds

As BIO_MAX_PAGES is smaller (on x86) than HPAGE_PMD_NR, we cannot use
the optimization ext4_mpage_readpages() provides.

So, for huge pages, we fallback directly to block_read_full_page().

This should be re-visited once we get multipage bvec upstream.

Signed-off-by: Kirill A. Shutemov <redacted>
---
 fs/ext4/readpage.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/ext4/readpage.c b/fs/ext4/readpage.c
index a81b829d56de..b865df0c0973 100644
--- a/fs/ext4/readpage.c
+++ b/fs/ext4/readpage.c
@@ -134,7 +134,7 @@ int ext4_mpage_readpages(struct address_space *mapping,
 				goto next_page;
 		}
 
-		if (page_has_buffers(page))
+		if (page_has_buffers(page) || PageTransHuge(page))
 			goto confused;
 
 		block_in_file = (sector_t)page->index << (PAGE_SHIFT - blkbits);
-- 
2.11.0
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