Re: [PATCH] ext4: change EXT4_IOC_GETSTATE ioctl to _IOR

[Theodore Ts'o]

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@xxxxxxxxx>

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