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Provide helpers to set and clear sb->s_readonly_remount including appropriate memory barriers. Also use this opportunity to document what the barriers pair with and why they are needed. Suggested-by: Dave Chinner <david@fromorbit.com> Signed-off-by: Jan Kara <jack@suse.cz> Reviewed-by: Dave Chinner <dchinner@redhat.com> Message-Id: <20230620112832.5158-1-jack@suse.cz> Signed-off-by: Christian Brauner <brauner@kernel.org>