[LU-15536] create an imperative SoM syncing utility

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.17.0
• Severity: 3
• Assignee: Jian Yu
• Reporter: John Hammond

Description

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.

Issue Links

• is related to: LU-11686 sanity test 807 fails with mounted subdirectory with error '/mnt/lustre/d807.sanity/single_dd expected blocks: 1, got: 0'