[PATCHv3 17/41] filemap: handle huge pages in filemap_fdatawait_range()

[Kirill A. Shutemov]

We writeback whole huge page a time.

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

diff --git a/mm/filemap.c b/mm/filemap.c
index 05b42d3e5ed8..53da93156e60 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -372,9 +372,14 @@ 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();
-- 
2.9.3

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