[LU-14731] mdd_changelog_llog_init() fails to clear orphans changelog entries when no users are registered

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.15.0
• Severity: 3
• Assignee: John Hammond
• Reporter: John Hammond

Description

In mdd_changelog_llog_init() the logic around getting the minimum user index is broken when there are no users registered. When no users are registered the computed user orphan index is always 0 and the if (unlikely(changelog_orphan.index < user_orphan.index)) branch is never entered.

0 is a poor sentinel for the minimum. It should use the maximum value representable in the type.