On Wed, Jul 14, 2021 at 02:19:00PM +1000, Dave Chinner wrote: > From: Dave Chinner <dchinner@xxxxxxxxxx> > > Currently on-disk feature checks require decoding the superblock > fileds and so can be non-trivial. We have almost 400 hundred > individual feature checks in the XFS code, so this is a significant > amount of code. To reduce runtime check overhead, pre-process all > the version flags into a features field in the xfs_mount at mount > time so we can convert all the feature checks to a simple flag > check. > > There is also a need to convert the dynamic feature flags to update > the m_features field. This is required for attr, attr2 and quota > features. New xfs_mount based wrappers are added for this. Nice! I've been thinking about something like this for a while to start decoupling the mount structure from the log sb, similar to what we did for the inode. Reviewed-by: Christoph Hellwig <hch@xxxxxx>
