[PATCHv5 24/36] ext4: make ext4_mpage_readpages() hugepage-aware

Kirill A. Shutemov
2016-11-29T11:22:52Z

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 <kirill.shutemov@linux.intel.com>
---
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);