[LU-12847] Document llapi_data_version() command and lfs-data_version.1 command

• Type: Bug
• Resolution: Unresolved
• Priority: Minor
• Severity: 3
• Assignee: WC Triage
• Reporter: Andreas Dilger

Description

Add man page for llapi_data_version() and the "lfs data_version" command. Clearly document whether this is only the data object version of if it includes the metadata change version. If it does not include the metadata version, is it possible to add a flag fir the command to include the metadata version, so that userspace can determine if MDT attributes were modified.

Verify that the data_version properly covers DoM components.

Issue Links

• is related to: LU-5657 adding missing man pages for the Lustre user API
• is related to: LU-930 Update or improvement to a Lustre man page, documentation, or messages

Comments

[Andreas Dilger]

Mike, while writing this ticket to add a man page for llapi_data_version() I wondered whether this command will properly report whether a DoM component is modified? That is important to avoid data loss if migrating a file.