linux-ext4 - [PATCHv2 2/3] ext4: use direct_IO_no

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Message-Id: <20100112194210.C27AC6E85C@peat.mtv.corp.google.com>
Date:	Tue, 12 Jan 2010 11:42:10 -0800 (PST)
From:	jiayingz@...gle.com (Jiaying Zhang)
To:	linux-ext4@...r.kernel.org
Cc:	tytso@....edu, mrubin@...gle.com, akpm@...ux-foundation.org
Subject: [PATCHv2 2/3] ext4: use direct_IO_no_locking in ext4 DIO read

    ext4: Use direct_IO_no_locking in ext4 dio read.
    
    Signed-off-by: Jiaying Zhang <jiayingz@...gle.com>

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 9ee3550..44d2e19 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3395,7 +3395,15 @@ static ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
 	}
 
 retry:
-	ret = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
+	if (rw == READ && test_opt(inode->i_sb, DIOREAD_NOLOCK)
+			&& (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL))
+		ret = blockdev_direct_IO_no_locking(rw, iocb, inode,
+				 inode->i_sb->s_bdev, iov,
+				 offset, nr_segs,
+				 ext4_get_block, NULL);
+	else
+		ret = blockdev_direct_IO(rw, iocb, inode,
+				 inode->i_sb->s_bdev, iov,
 				 offset, nr_segs,
 				 ext4_get_block, NULL);
 	if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
--
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