[LU-14337] return valid stripe_count and stripe_size instead of 0 for DoM files

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.14.0, Lustre 2.15.0
• Severity: 3
• Assignee: Emoly Liu
• Reporter: Emoly Liu

Description

Return valid stripe_count and stripe_size instead of 0 for DoM files to avoid divide-by-zero for older userspace that calls this ioctl, e.g. lustre ADIO driver.

Issue Links

• is related to: LU-19208 lmm_stripe_count: 0 in DoM component triggers divide-by-zero in MPIIO
• is related to: LU-14316 lfs: using old ioctl(LL_IOC_LOV_GETSTRIPE), use llapi_layout_get_by_path()