Re: [PATCH v4 3/3] ext4: unconditionally enable the i_version counter

On Fri, Aug 12, 2022 at 02:37:27PM +0200, Lukas Czerner wrote:

From: Jeff Layton <jlayton@kernel.org>

The original i_version implementation was pretty expensive, requiring a
log flush on every change. Because of this, it was gated behind a mount
option (implemented via the MS_I_VERSION mountoption flag).

Commit ae5e165d855d (fs: new API for handling inode->i_version) made the
i_version flag much less expensive, so there is no longer a performance
penalty from enabling it. xfs and btrfs already enable it
unconditionally when the on-disk format can support it.

Have ext4 ignore the SB_I_VERSION flag, and just enable it
unconditionally. While we're in here, remove the handling of
Opt_i_version as well, since we're almost to 5.20 anyway.

Ideally, we'd couple this change with a way to disable the i_version
counter (just in case), but the way the iversion mount option was
implemented makes that difficult to do. We'd need to add a new mount
option altogether or do something with tune2fs. That's probably best
left to later patches if it turns out to be needed.

[ Removed leftover bits of i_version from ext4_apply_options() since it
now can't ever be set in ctx->mask_s_flags -- lczerner ]

Cc: Dave Chinner <david@fromorbit.com>
Cc: Benjamin Coddington <redacted>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Lukas Czerner <redacted>
---

Since ext4 seems to ignore unknown mount options in ext4_parse_param()
removing seems good,
Reviewed-by: Christian Brauner (Microsoft) <brauner@kernel.org>