[LU-16258] Explicitly support .splice_write

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.16.0, Lustre 2.15.2
• Severity: 3
• Assignee: Shaun Tancheff
• Reporter: Shaun Tancheff

Description

    Linux commit v5.9-rc1-6-g36e2c7421f02
      fs: don't allow splice read/write without explicit ops
    
    Lustre supports splice_write and previously provide handlers
    for splice_read.
    Explicitly use iter_file_splice_write, if it exists.

Issue Links

• is related to: LU-16020 sanity test_244a: FAIL: sendfile+grouplock failed
• is related to: LU-15781 Ubuntu 22.04 LTS release support