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[PATCHv2,17/41] filemap: handle huge pages in filemap_fdatawait_range()

Message ID 1471027104-115213-18-git-send-email-kirill.shutemov@linux.intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Kirill A . Shutemov Aug. 12, 2016, 6:38 p.m. UTC 
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(+)
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Patch

diff --git a/mm/filemap.c b/mm/filemap.c
index 93fa97f143ab..429f9a0962b3 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();