linux-kernel - Re: [PATCH 1/5] vfs: create a generic checking and prep function for FS_IOC

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Message-ID: <20190626040202.GA32272@ZenIV.linux.org.uk>
Date:   Wed, 26 Jun 2019 05:02:02 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     "Darrick J. Wong" <darrick.wong@...cle.com>
Cc:     matthew.garrett@...ula.com, yuchao0@...wei.com, tytso@....edu,
        shaggy@...nel.org, ard.biesheuvel@...aro.org, josef@...icpanda.com,
        hch@...radead.org, clm@...com, adilger.kernel@...ger.ca,
        jk@...abs.org, jack@...e.com, dsterba@...e.com, jaegeuk@...nel.org,
        cluster-devel@...hat.com, jfs-discussion@...ts.sourceforge.net,
        linux-efi@...r.kernel.org, Jan Kara <jack@...e.cz>,
        reiserfs-devel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, linux-xfs@...r.kernel.org,
        linux-nilfs@...r.kernel.org, linux-mtd@...ts.infradead.org,
        ocfs2-devel@....oracle.com, linux-fsdevel@...r.kernel.org,
        linux-ext4@...r.kernel.org, Christoph Hellwig <hch@....de>,
        linux-btrfs@...r.kernel.org
Subject: Re: [PATCH 1/5] vfs: create a generic checking and prep function for
 FS_IOC_SETFLAGS

On Tue, Jun 25, 2019 at 07:32:10PM -0700, Darrick J. Wong wrote:
> From: Darrick J. Wong <darrick.wong@...cle.com>
> 
> Create a generic function to check incoming FS_IOC_SETFLAGS flag values
> and later prepare the inode for updates so that we can standardize the
> implementations that follow ext4's flag values.

Change in efivarfs behaviour deserves a note.  I'm not saying it's wrong,
but behaviour is changed there - no-op FS_IOC_SETFLAGS used to fail
without CAP_LINUX_IMMUTABLE...