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

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Date:   Mon, 3 Jul 2017 17:03:54 +0200
From:   Andreas Gruenbacher <agruenba@...hat.com>
To:     Christoph Hellwig <hch@....de>
Cc:     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 7:37 PM, Christoph Hellwig <hch@....de> wrote:
> 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).

What else does this piece of code from mainline xfs_seek_hole_data()
do instead then?

        lock = xfs_ilock_data_map_shared(ip);

        end = i_size_read(inode);
        offset = __xfs_seek_hole_data(inode, start, end, whence);

Thanks,
Andreas