linux-ext4 - Re: [PATCH 5/5] ext4: Switch to iomap for SEEK_HOLE / SEEK

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Date:   Fri, 30 Jun 2017 19:37:40 +0200
From:   Christoph Hellwig <hch@....de>
To:     Andreas Gruenbacher <agruenba@...hat.com>
Cc:     Christoph Hellwig <hch@....de>, Jan Kara <jack@...e.cz>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        linux-xfs@...r.kernel.org, linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 5/5] ext4: Switch to iomap for SEEK_HOLE / SEEK_DATA

On Fri, Jun 30, 2017 at 01:51:10PM +0200, Andreas Gruenbacher wrote:
> Also, ext4 no longer calls inode_lock or inode_lock_shared; that needs
> to be added back for consistency between reading i_size and walking
> the file extents.

At least for XFS we never had such a consistency as we never took
the iolock (aka i_rwsem).