On Mon, Sep 02, 2019 at 04:20:37PM +0200, David Sterba wrote: > Oh right, I think the reasons are historical and that we can remove the > options nowadays. From the compatibility POV this should be safe, with > ACLs compiled out, no tool would use them, and no harm done when the > code is present but not used. > > There were some efforts by embedded guys to make parts of kernel more > configurable to allow removing subsystems to reduce the final image > size. In this case I don't think it would make any noticeable > difference, eg. the size of fs/btrfs/acl.o on release config is 1.6KiB, > while the whole module is over 1.3MiB. Given that the erofs folks have an actual use case for it I think it is fine to keep the options, I just wanted to ensure this wasn't copy and pasted for no good reason. Note that for XFS we don't have an option for xattrs, as those are integral to a lot of file system features. WE have an ACL option mostly for historic reasons.
