linux-kernel - Re: Making linkat() able to overwrite the target

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Date:   Fri, 17 Jan 2020 08:22:01 -0800
From:   Omar Sandoval <osandov@...ndov.com>
To:     David Howells <dhowells@...hat.com>
Cc:     Colin Walters <walters@...bum.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, Christoph Hellwig <hch@....de>,
        Theodore Ts'o <tytso@....edu>, adilger.kernel@...ger.ca,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Chris Mason <clm@...com>, josef@...icpanda.com,
        dsterba@...e.com, linux-ext4 <linux-ext4@...r.kernel.org>,
        xfs <linux-xfs@...r.kernel.org>, linux-btrfs@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: Making linkat() able to overwrite the target

On Fri, Jan 17, 2020 at 11:42:55AM +0000, David Howells wrote:
> Hi Omar,
> 
> Do you still have your AT_REPLACE patches?  You said that you'd post a v4
> series, though I don't see it.  I could make use of such a feature in
> cachefiles inside the kernel.  For my original question, see:
> 
> 	https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/log/?h=fscache-iter
> 
> And do you have ext4 support for it?

Hi,

Yes I still have those patches lying around and I'd be happy to dust
them off and resend them. I don't have ext4 support. I'd be willing to
take a stab at ext4 once Al is happy with the VFS part unless someone
more familiar with ext4 wants to contribute that support.

Thanks for reviving interesting in this!