[LU-10220] Incorrect record length allocated in mdd_changelog_data_store_by_fid()

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Fix Version/s: Lustre 2.11.0, Lustre 2.10.2
• Affects Version/s: Lustre 2.10.1
• Labels: changelogs patch
• Severity: 3
• Assignee: Sebastien Buisson (Inactive)
• Reporter: Sebastien Buisson (Inactive)

Description

In mdd_changelog_data_store_by_fid(), the record length calculated to allocate mti_big_buf is not correct, because it forgets to take the header size of struct llog_changelog_rec into account.

I guess it never generated memory corruptions before, because the buffer size allocated in a previous call to mdd_declare_changelog_store() was covering the need.
But now that LU-9727 adds more information in changelog records, I am able to provoke memory corruptions.

I will submit a patch to fix this problem.

Sebastien.