linux-ext4 - [PATCH 2/3] Revert "ext4: fix off-by-one error when writing back pages before dio read"

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Message-Id: <1566871552-60946-3-git-send-email-joseph.qi@linux.alibaba.com>
Date:   Tue, 27 Aug 2019 10:05:51 +0800
From:   Joseph Qi <joseph.qi@...ux.alibaba.com>
To:     Theodore Ts'o <tytso@....edu>, Andreas Dilger <adilger@...ger.ca>,
        Jan Kara <jack@...e.cz>
Cc:     linux-ext4@...r.kernel.org, Dave Chinner <david@...morbit.com>
Subject: [PATCH 2/3] Revert "ext4: fix off-by-one error when writing back pages before dio read"

This reverts commit e5465795cac4 ("ext4: fix off-by-one error when
writing back pages before dio read").
It is related to the following revert 16c54688592c ("ext4: Allow
parallel DIO reads") which causes significant performance regression in
mixed random read/write scenario.

Signed-off-by: Joseph Qi <joseph.qi@...ux.alibaba.com>
---
 fs/ext4/inode.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 0f505f0..16077ec 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3875,7 +3875,7 @@ static ssize_t ext4_direct_IO_read(struct kiocb *iocb, struct iov_iter *iter)
 	 */
 	inode_lock_shared(inode);
 	ret = filemap_write_and_wait_range(mapping, iocb->ki_pos,
-					   iocb->ki_pos + count - 1);
+					   iocb->ki_pos + count);
 	if (ret)
 		goto out_unlock;
 	ret = __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev,
-- 
1.8.3.1