linux-ext4 - Re: [PATCH 0/5] ext4/overlayfs: fiemap related fixes

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Message-Id: <20200425111456.A2A484C046@d06av22.portsmouth.uk.ibm.com>
Date:   Sat, 25 Apr 2020 16:44:55 +0530
From:   Ritesh Harjani <riteshh@...ux.ibm.com>
To:     Amir Goldstein <amir73il@...il.com>,
        Christoph Hellwig <hch@...radead.org>
Cc:     Ext4 <linux-ext4@...r.kernel.org>, Jan Kara <jack@...e.cz>,
        Theodore Tso <tytso@....edu>,
        Andreas Dilger <adilger@...ger.ca>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        Murphy Zhou <jencce.kernel@...il.com>,
        Miklos Szeredi <miklos@...redi.hu>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        overlayfs <linux-unionfs@...r.kernel.org>
Subject: Re: [PATCH 0/5] ext4/overlayfs: fiemap related fixes



On 4/25/20 4:19 PM, Amir Goldstein wrote:
> On Sat, Apr 25, 2020 at 12:43 PM Christoph Hellwig <hch@...radead.org> wrote:
>>
>> On Sat, Apr 25, 2020 at 12:11:59PM +0300, Amir Goldstein wrote:
>>> FWIW, I agree with you.
>>> And seems like Jan does as well, since he ACKed all your patches.
>>> Current patches would be easier to backport to stable kernels.
>>
>> Honestly, the proper fix is pretty much trivial.  I wrote it up this
>> morning over coffee:
>>
>>      http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/fiemap-fix
>>
>> Still needs more testing, though.
> 
> Very slick!
> 
> I still think Ritesh's patches are easier for backporting because they are
> mostly contained within the ext4/overlayfs subsystems and your patch
> can follow up as interface cleanup.
> 
> I would use as generic helper name generic_fiemap_checks()
> akin to generic_write_checks() and generic_remap_file_range_prep() =>
> generic_remap_checks().

If it's ok, I will be happy to do this cleanup in the 2nd round.


-ritesh