We have ./lustre/doc/llsom_sync.8 to sync size on MDT xattrs but it is based on changelogs. For scanning based on SoM to be useful we need a utility (of lfs subcommand) that can be used to resynchronize the SoM xattrs of the files we supply.

In addition to a usual interface

lfs somsync FILE...

we should also support Lustre client mount point followed by a list of FIDs

lfs somsync --by-fid MOUNT FID...

(Similar to 'lfs rmfid', allowing use with xargs.)

Note that lsom_update_one() has the steps to resynchronize SoM.