linux-kernel - Re: Immutable vs read-only for Windows compatibility

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Message-ID: <Z5CKtOwB8ZsbX4N4@infradead.org>
Date: Tue, 21 Jan 2025 22:05:40 -0800
From: Christoph Hellwig <hch@...radead.org>
To: "Darrick J. Wong" <djwong@...nel.org>
Cc: Amir Goldstein <amir73il@...il.com>,
	Pali Rohár <pali@...nel.org>,
	ronnie sahlberg <ronniesahlberg@...il.com>,
	Chuck Lever <chuck.lever@...cle.com>,
	Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
	linux-fsdevel@...r.kernel.org, linux-cifs@...r.kernel.org,
	linux-kernel@...r.kernel.org, Steve French <sfrench@...ba.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	xfs <linux-xfs@...r.kernel.org>
Subject: Re: Immutable vs read-only for Windows compatibility

On Fri, Jan 17, 2025 at 12:21:12PM -0800, Darrick J. Wong wrote:
> > Full disclosure - I have an out of tree xfs patch that implements
> > ioctls XFS_IOC_[GS]ETDOSATTRAT and stashes these
> > attributes in the unused di_dmevmask space.
> 
> [cc linux-xfs]
> 
> Urrrrk, please don't fork the xfs ondisk format!

Yeah, adding your own bits to any file system on-disk format is a huge
no-go.