linux-ext4 - [PATCHv1, RFC 16/33] filemap: handle huge pages in filemap_fdatawait

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Date:	Tue, 26 Jul 2016 03:35:18 +0300
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	"Theodore Ts'o" <tytso@....edu>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	Jan Kara <jack@...e.com>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	Hugh Dickins <hughd@...gle.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Hansen <dave.hansen@...el.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Matthew Wilcox <willy@...radead.org>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-block@...r.kernel.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCHv1, RFC 16/33] filemap: handle huge pages in filemap_fdatawait_range()

We writeback whole huge page a time.

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

diff --git a/mm/filemap.c b/mm/filemap.c
index ad73b99c5ba7..3d46db277e73 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -371,9 +371,14 @@ 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();
-- 
2.8.1

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