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From:   "Lu, Davina" <davinalu@amazon.com>
To:     Theodore Ts'o <tytso@mit.edu>
CC:     "linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>,
        "adilger.kernel@dilger.ca" <adilger.kernel@dilger.ca>,
        "regressions@lists.linux.dev" <regressions@lists.linux.dev>,
        "stable@vger.kernel.org" <stable@vger.kernel.org>,
        "Mohamed Abuelfotoh, Hazem" <abuehaze@amazon.com>,
        hazem ahmed mohamed <hazem.ahmed.abuelfotoh@gmail.com>,
        "Ritesh Harjani (IBM)" <ritesh.list@gmail.com>,
        "Kiselev, Oleg" <okiselev@amazon.com>,
        "Liu, Frank" <franklmz@amazon.com>
Subject: configurable lazytime for EXT4, is name ok?
Thread-Topic: configurable lazytime for EXT4, is name ok?
Thread-Index: AdjzC8FGHNuLQ/rLSpuMIprsbw2tdw==
Date:   Tue, 8 Nov 2022 00:51:47 +0000
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Hi Ted,

Sorry to bother you with a quick question: I am doing a patch for configura=
ble lazytime for EXT4, Before submit the patch I would like to double check=
 the names first. I added a "lazytime_flush=3Dxxx" in mount show options, n=
ot sure if this is ok to continue.=20

As far as I know, lazytime is an option for EXT4 and other file systems. My=
 patch make ext4 can be supported as before: without any parameters E.g. mo=
unt -o lazytime,...=20
Or can be supported with parameters (in ms) E.g. mount -o lazytime=3D30, ..=
.=20

So when we show the options by mount -t ext4, if no parameter configured, t=
he result shows as before:
/dev/nvme1n1 on /rdsdbdata1 type ext4 (rw,noatime,nodiratime,lazytime,data=
=3Dordered)

If has parameters configured, the result shows as below, added one "lazytim=
e_flush=3Dxxx". Not sure if this sound ok for you?=20
/dev/nvme1n1 on /rdsdbdata1 type ext4 (rw,noatime,nodiratime,lazytime,lazyt=
ime_flush=3D100ms,data=3Dordered)

I tested "ext4/053"of latest xfstest-dev with my patch and it can pass the =
result(I changed a bit 053 since I am running on 5.10, removed one mount op=
tion" no_prefetch_block_bitmaps" that  5.10 doesn't support).

Thanks
Davina