[LU-12434] use filesystem default dir layout for new directories

• Type: Bug
• Resolution: Duplicate
• Priority: Major
• Affects Version/s: Upstream, Lustre 2.12.0, Lustre 2.10.8
• Severity: 3
• Assignee: Lai Siyao
• Reporter: Lai Siyao

Description

Filesystem default dir layout stored in ROOT is not used in new directory creation, this is a technical debt of DNE code. It should follow the same semantic as filesystem default file layout:
1. if user specified layout, use the input to create new directories.
2. else if parent directory has default dir layout, check whether this default dir layout is sufficient (stripe_count is not 0 and hash_type is not 'none'), if so, use it to create.
3. else if filesystem has default dir layout, and fill missing fields with it, then check whether it's sufficient, if so, use it to create.
4. else fill missing fields with default values (stripe_count is "1", hash_type is "fnv16"), and create.

Issue Links

• is related to: LU-12624 DNE3: striped directory allocate stripes by QoS
• is related to: LU-14792 DNE3: enable filesystem-wide default LMV
• is related to: LU-11213 DNE3: remote mkdir() in ROOT/ by default