Fixes for 5.14-rc: * Fix shrink eligibility checking when sparse inode clusters enabled. * Reset '..' directory entries when unlinking directories to prevent verifier errors if fs is shrinked later. * Don't report unusable extent size hints to FSGETXATTR. * Don't warn when extent size hints are unusable because the sysadmin configured them that way. * Fix insufficient parameter validation in GROWFSRT ioctl. * Fix integer overflow when adding rt volumes to filesystem.