linux-ext4 - Re: fsync_mode mount option for ext4

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Message-ID: <20190528034830.GH10043@codeaurora.org>
Date:   Tue, 28 May 2019 09:18:30 +0530
From:   Sahitya Tummala <stummala@...eaurora.org>
To:     Theodore Ts'o <tytso@....edu>
Cc:     Andreas Dilger <adilger.kernel@...ger.ca>,
        linux-ext4@...r.kernel.org
Subject: Re: fsync_mode mount option for ext4

Hi Ted,

On Mon, May 27, 2019 at 11:40:07PM -0400, Theodore Ts'o wrote:
> On Tue, May 28, 2019 at 08:52:57AM +0530, Sahitya Tummala wrote:
> > Hi Ted, Andreas,
> > 
> > Do you think this mount option "fsync_mode=nobarrier"
> > can be added for EXT4 as well like in F2FS? Please
> > share your thoughts on this.
> > 
> > https://lore.kernel.org/patchwork/patch/908934/
> 
> Ext4 already has the nobarrier mount option.
> 

Yes, but fsync_mode=nobarrier is little different than
a general nobarrier option. The fsync_mode=nobarrier is
only controlling the flush policy for fsync() path, unlike
the nobarrier mount option which is applicable at all
places in the filesystem.

Thanks,

> Cheers,
> 
>      	     	     	       	     - Ted

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