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Date: Thu, 15 Apr 2021 09:49:21 +0200 From: Christian Brauner <christian.brauner@...ntu.com> To: Christoph Hellwig <hch@....de> Cc: Theodore Ts'o <tytso@....edu>, Eryu Guan <guan@...u.me>, Christian Brauner <brauner@...nel.org>, fstests@...r.kernel.org, linux-ext4@...r.kernel.org, "Darrick J . Wong" <djwong@...nel.org>, David Howells <dhowells@...hat.com>, Amir Goldstein <amir73il@...il.com> Subject: Re: [PATCH -RFC] ext4: add feature file to advertise that ext4 supports idmapped mounts On Thu, Apr 15, 2021 at 07:54:08AM +0200, Christoph Hellwig wrote: > On Wed, Apr 14, 2021 at 04:47:10PM -0400, Theodore Ts'o wrote: > > On Mon, Apr 12, 2021 at 06:41:20PM -0400, Theodore Ts'o wrote: > > > In the ideal world, if the kernel wasn't compiled with the necessary > > > CONFIG options enabled, it's desirable of the test can detect that > > > fact and skip running the test instead failing and forcing the person > > > running the test to try to figure out whether this is a legitmate file > > > system bug or a just a test setup bug. > > > > So it would make it easier for me to manage running xfstests on ext4 > > if I had added something like this to ext4 and sent it to Linus before > > v5.12 is released. What do folks think? > > Completely stupid. This is a VFS-level feature and we need to have > proper VFS-level testing (which we have through creating a mount > with the option), not fs-specific band aids. Harsh words. :) Christoph's right though I think for the xfstests we don't need it and we're covered with what we have in the version I sent out last Sunday. However, as a general way of advertising to users that ext4 supports idmapped mounts I don't necessarily see a problem with that. It doesn't have implications for other filesystems and ext4 already advertises other features in a similar way. Christian
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