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    Subject[PATCHv6 10/37] filemap: handle huge pages in filemap_fdatawait_range()
    Date
    We writeback whole huge page a time.

    Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
    ---
    mm/filemap.c | 5 +++++
    1 file changed, 5 insertions(+)

    diff --git a/mm/filemap.c b/mm/filemap.c
    index 4e398d5e4134..f5cd654b3662 100644
    --- a/mm/filemap.c
    +++ b/mm/filemap.c
    @@ -405,9 +405,14 @@ static int __filemap_fdatawait_range(struct address_space *mapping,
    if (page->index > end)
    continue;

    + page = compound_head(page);
    wait_on_page_writeback(page);
    if (TestClearPageError(page))
    ret = -EIO;
    + if (PageTransHuge(page)) {
    + index = page->index + HPAGE_PMD_NR;
    + i += index - pvec.pages[i]->index - 1;
    + }
    }
    pagevec_release(&pvec);
    cond_resched();
    --
    2.11.0
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