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

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Date:   Mon, 27 Apr 2020 03:38:54 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Amir Goldstein <amir73il@...il.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Ritesh Harjani <riteshh@...ux.ibm.com>,
        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 Mon, Apr 27, 2020 at 01:15:22PM +0300, Amir Goldstein wrote:
> On Mon, Apr 27, 2020 at 9:28 AM Christoph Hellwig <hch@...radead.org> wrote:
> >
> > On Sat, Apr 25, 2020 at 01:49:43PM +0300, Amir Goldstein wrote:
> > > I would use as generic helper name generic_fiemap_checks()
> > > akin to generic_write_checks() and generic_remap_file_range_prep() =>
> > > generic_remap_checks().
> >
> > None of the other fiemap helpers use the redundant generic_ prefix.
> 
> Fine. I still don't like the name _validate() so much because it implies
> yes or no, not length truncating.
> 
> What's more, if we decide that FIEMAP_FLAG_SYNC handling should
> be done inside this generic helper, we would definitely need to rename it
> again. So how about going for something a bit more abstract like
> fiemap_prep() or whatever.

Ok, I'll rename it to fiemap_prep.

> 
> What is your take about FIEMAP_FLAG_SYNC handling btw?

Oh, I hadn't really noticed that mess.  Taking it into fiemap_prep
might make most sense, so that it nominally is under fs control for
e.g. locking purposes.