linux-ext4 - Re: [PATCH] ext4: change EXT4_IOC_GETSTATE ioctl to

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Message-ID: <YSzJjtUtXRxeXSwl@mit.edu>
Date:   Mon, 30 Aug 2021 08:05:34 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     Denis Efremov <efremov@...ux.com>
Cc:     adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ext4: change EXT4_IOC_GETSTATE ioctl to _IOR

On Mon, Aug 30, 2021 at 01:05:08PM +0300, Denis Efremov wrote:
> EXT4_IOC_GETSTATE is only used to read the state flags from the kernel.
> 
> Fixes: 1ad3ea6e0a69 ("ext4: add a new ioctl EXT4_IOC_GETSTATE")
> Signed-off-by: Denis Efremov <efremov@...ux.com>

NACK.  This will break ABI compatibility, which is way important than
getting the ioctl encoding incorrect.

If you really care, I suppose we could add an EXT4_IOC_GETSTATE_OLD
for the old value, and then support EXT4_IOC_GETSTATE and
EXT4_IOC_GETSTATE_OLD for a decade or two until all of the binaries in
the world get recompiled.

Is it worth it?  Eh....

						- Ted