linux-ext4 - Re: [RFCv2 0/4] ext4: bmap & fiemap conversion to use iomap

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Date:   Thu, 20 Feb 2020 09:09:53 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Ritesh Harjani <riteshh@...ux.ibm.com>
Cc:     Jan Kara <jack@...e.cz>,
        "Darrick J. Wong" <darrick.wong@...cle.com>, tytso@....edu,
        adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, hch@...radead.org,
        cmaiolino@...hat.com
Subject: Re: [RFCv2 0/4] ext4: bmap & fiemap conversion to use iomap

On Thu, Feb 20, 2020 at 10:33:03PM +0530, Ritesh Harjani wrote:
> So I was making some changes along the above lines and I think we can take
> below approach for filesystem which could determine the
> _EXTENT_LAST relatively easily and for cases if it cannot
> as Jan also mentioned we could keep the current behavior as is and let
> iomap core decide the last disk extent.

Well, given that _EXTENT_LAST never worked properly on any file system
since it was added this actually changes behavior and could break
existing users.  I'd rather update the documentation to match reality
rather than writing a lot of code for a feature no one obviously cared
about for years.