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Re: [PATCH v11 21/48] ext4: Add richacl feature flag

To: Austin S Hemmelgarn <ahferroin7@xxxxxxxxx>
Subject: Re: [PATCH v11 21/48] ext4: Add richacl feature flag
From: Andreas Gruenbacher <agruenba@xxxxxxxxxx>
Date: Fri, 16 Oct 2015 19:41:30 +0200
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>, "Theodore Ts'o" <tytso@xxxxxxx>, Andreas Dilger <adilger.kernel@xxxxxxxxx>, "J. Bruce Fields" <bfields@xxxxxxxxxxxx>, Jeff Layton <jlayton@xxxxxxxxxxxxxxx>, Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>, Anna Schumaker <anna.schumaker@xxxxxxxxxx>, Dave Chinner <david@xxxxxxxxxxxxx>, linux-ext4 <linux-ext4@xxxxxxxxxxxxxxx>, xfs@xxxxxxxxxxx, LKML <linux-kernel@xxxxxxxxxxxxxxx>, linux-fsdevel <linux-fsdevel@xxxxxxxxxxxxxxx>, Linux NFS Mailing List <linux-nfs@xxxxxxxxxxxxxxx>, linux-cifs@xxxxxxxxxxxxxxx, Linux API <linux-api@xxxxxxxxxxxxxxx>, "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <5621346E.5000500@xxxxxxxxx>
References: <1445008706-15115-1-git-send-email-agruenba@xxxxxxxxxx> <1445008706-15115-22-git-send-email-agruenba@xxxxxxxxxx> <5621346E.5000500@xxxxxxxxx>
On Fri, Oct 16, 2015 at 7:31 PM, Austin S Hemmelgarn
<ahferroin7@xxxxxxxxx> wrote:
> I would like to re-iterate, on both XFS and ext4, I _really_ think this
> should be a ro_compat flag, and not an incompat one.  If a person has the
> ability to mount the FS (even if it's a read-only mount), then they by
> definition have read access to the file or partition that the filesystem is
> contained in, which means that any ACL's stored on the filesystem are
> functionally irrelevant,

It is unfortunately not safe to make such a file system accessible to
other users, so the feature is not strictly read-only compatible.

Andreas

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