linux-ext4 - Re: [PATCH] ext4: fix handling mount -o remount,nolazytime

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Message-ID: <20200220182231.GA602834@mit.edu>
Date:   Thu, 20 Feb 2020 13:22:31 -0500
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Cc:     Andreas Dilger <adilger.kernel@...ger.ca>,
        linux-ext4@...r.kernel.org, Karel Zak <kzak@...hat.com>,
        Dmitry Monakhov <dmtrmonakhov@...dex-team.ru>
Subject: Re: [PATCH] ext4: fix handling mount -o remount,nolazytime

On Thu, Feb 20, 2020 at 06:11:04PM +0300, Konstantin Khlebnikov wrote:
> Usually all these options are saved in /etc/fstab and
> mount -o remount,... includes them into line passed into syscall.
> In this case remounting any other option will not disable lazytime.

This assumes that there *is* an /etc/fstab entry.  Sometimes system
administrators will perform ad hoc mounts of devices that aren't
mentioned in /etc/fstab.

For example, consider how xfstests works; it will run mounts commands
mentioning the test and scratch devices which are not mentioned on
/etc/fstab.

						- Ted