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

[Kirill A. Shutemov]

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.shute...@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);
-- 
2.11.0