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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org,
	stable@vger.kernel.org
Cc: Ojaswin Mujoo <ojaswin@linux.ibm.com>,
	Ritesh Harjani <ritesh.list@gmail.com>,
	Theodore Ts'o <tytso@mit.edu>,
	Sasha Levin <sashal@kernel.org>,
	adilger.kernel@dilger.ca,
	linux-ext4@vger.kernel.org
Subject: [PATCH AUTOSEL 6.1 08/14] ext4: enable dioread_nolock as default for bs < ps case
Date: Mon, 15 Jan 2024 20:06:10 -0500
Message-ID: <20240116010642.218876-8-sashal@kernel.org>
In-Reply-To: <20240116010642.218876-1-sashal@kernel.org>
References: <20240116010642.218876-1-sashal@kernel.org>
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From: Ojaswin Mujoo <ojaswin@linux.ibm.com>

[ Upstream commit e89fdcc425b6feea4dfb33877e9256757905d763 ]

dioread_nolock was originally disabled as a default option for bs < ps
scenarios due to a data corruption issue. Since then, we've had some
fixes in this area which address such issues. Enable dioread_nolock by
default and remove the experimental warning message for bs < ps path.

dioread for bs < ps has been tested on a 64k pagesize machine using:

kvm-xfstest -C 3 -g auto

with the following configs:

64k adv bigalloc_4k bigalloc_64k data_journal encrypt
dioread_nolock dioread_nolock_4k ext3 ext3conv nojournal

And no new regressions were seen compared to baseline kernel.

Suggested-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Link: https://lore.kernel.org/r/20231101154717.531865-1-ojaswin@linux.ibm.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/ext4/super.c | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 601e097e1720..93ede89baeca 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -2722,15 +2722,6 @@ static int ext4_check_opt_consistency(struct fs_context *fc,
 		return -EINVAL;
 	}
 
-	if (ctx_test_mount_opt(ctx, EXT4_MOUNT_DIOREAD_NOLOCK)) {
-		int blocksize =
-			BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
-		if (blocksize < PAGE_SIZE)
-			ext4_msg(NULL, KERN_WARNING, "Warning: mounting with an "
-				 "experimental mount option 'dioread_nolock' "
-				 "for blocksize < PAGE_SIZE");
-	}
-
 	err = ext4_check_test_dummy_encryption(fc, sb);
 	if (err)
 		return err;
@@ -4345,7 +4336,7 @@ static void ext4_set_def_opts(struct super_block *sb,
 	    ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
 		set_opt(sb, DELALLOC);
 
-	if (sb->s_blocksize == PAGE_SIZE)
+	if (sb->s_blocksize <= PAGE_SIZE)
 		set_opt(sb, DIOREAD_NOLOCK);
 }
 
-- 
2.43.0