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    Subject[PATCHv5 24/36] ext4: make ext4_mpage_readpages() hugepage-aware
    Date
    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);
    --
    2.10.2
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