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From:   David Sterba <dsterba@suse.cz>
To:     Nikolay Borisov <nborisov@suse.com>
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        linux-btrfs@vger.kernel.org
Subject: Re: [PATCH] shared/298: Wire btrfs support in get_free_sectors
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On Wed, Feb 06, 2019 at 05:33:59PM +0200, Nikolay Borisov wrote:
>  [ "$FSTYP" = "xfs" ] && MKFS_OPTIONS="-f $MKFS_OPTIONS"
> +[ "$FSTYP" = "btrfs" ] && MKFS_OPTIONS="-f -dsingle -msingle"

This would drop anything that the original MKFS_OPTIONS had, eg. -O
features or -K, that's an example what I use.