[PATCH v3 11/18] ext4: Tell the VFS that readpage was synchronous

From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
To: linux-fsdevel@vger.kernel.org
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>,
	linux-mm@kvack.org, "Theodore Ts'o" <tytso@mit.edu>,
	Andreas Dilger <adilger.kernel@dilger.ca>,
	linux-ext4@vger.kernel.org
Subject: [PATCH v3 11/18] ext4: Tell the VFS that readpage was synchronous
Date: Fri, 16 Oct 2020 17:04:36 +0100	[thread overview]
Message-ID: <20201016160443.18685-12-willy@infradead.org> (raw)
In-Reply-To: <20201016160443.18685-1-willy@infradead.org>

The ext4 inline data readpage implementation was already synchronous,
so use AOP_UPDATED_PAGE to avoid cycling the page lock.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 fs/ext4/inline.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c
index 75c97bca0815..2a489243e4de 100644
--- a/fs/ext4/inline.c
+++ b/fs/ext4/inline.c
@@ -490,7 +490,8 @@ static int ext4_read_inline_page(struct inode *inode, struct page *page)
 	zero_user_segment(page, len, PAGE_SIZE);
 	SetPageUptodate(page);
 	brelse(iloc.bh);
-
+	if (ret >= 0)
+		return AOP_UPDATED_PAGE;
 out:
 	return ret;
 }
@@ -514,12 +515,14 @@ int ext4_readpage_inline(struct inode *inode, struct page *page)
 	else if (!PageUptodate(page)) {
 		zero_user_segment(page, 0, PAGE_SIZE);
 		SetPageUptodate(page);
+		ret = AOP_UPDATED_PAGE;
 	}
 
 	up_read(&EXT4_I(inode)->xattr_sem);
 
-	unlock_page(page);
-	return ret >= 0 ? 0 : ret;
+	if (ret < 0)
+		unlock_page(page);
+	return ret;
 }
 
 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
-- 
2.28.0

