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

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Date:   Fri, 30 Jun 2017 13:51:10 +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 Thu, Jun 29, 2017 at 3:54 PM, Christoph Hellwig <hch@....de> wrote:
> Switch to the iomap_seek_hole and iomap_seek_data helpers for
> implementing lseek SEEK_HOLE / SEEK_DATA, and remove all the
> code that isn't needed any more.
>
> Note that with this patch ext4 will now always depend on the iomap
> code instead of only when CONFIG_DAX is enabled, and it requires
> adding a call into the extent status tree for iomap_begin as well
> to properly deal with delalloc extents.

This breaks SEEK_HOLE / SEEK_DATA on filesystems with the inline_data feature.

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.

Thanks,
Andreas