[LU-16194] Define negative PFL extent start/end as invalid

• Type: Improvement
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.16.0
• Affects Version/s: Lustre 2.12.8, Lustre 2.15.1
• Environment: Servers: CentOS 7.9 (3.10.0-1160.49.1.el7.x86_64), Lustre 2.12.8, ZFS 0.8.5 ; 2.12 Clients: CentOS 7.9 (3.10.0-1160.53.1.el7.x86_64), Lustre 2.12.8 ; 2.15 Clients: CentOS 7.9 (3.10.0-1160.76.1.el7.x86_64), Lustre 2.15.1
• Severity: 3
• Assignee: Feng Lei
• Reporter: Feng Lei

Description

Even though lu_extent.e_start and lu_extent.e_end are u64 type, we convert them to s64 and check whether they are negative values on MDS. All negative values except -1 (EOF) are regarded as invalid.

Issue Links

• is related to: LU-17450 sanity: interop test failures with master+2.15
• is related to: LU-16152 PFL YAML file with extent >= 2G leads to overflow when used as template; may trigger MDS kernel panic