[LTP] Add logical_block_metadata_cap struct fallback

[linuxtestproject.agent@gmail.com]

Hi Andrea,

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On Wed, 25 Mar 2026 15:19:10 +0100, Andrea Cervesato wrote:
> Add logical_block_metadata_cap struct fallback
>
> Add UAPI fallback definitions for struct logical_block_metadata_cap,
> FS_IOC_GETLBMD_CAP ioctl and related LBMD_* constants in lapi/fs.h

The commit message claims LBMD_* constants are added, but none appear in
the diff. The kernel's uapi/linux/fs.h defines LBMD_PI_CAP_INTEGRITY,
LBMD_PI_CAP_REFTAG, LBMD_PI_CSUM_{NONE,IP,CRC16_T10DIF,CRC64_NVME}, and
LBMD_SIZE_VER0 — either add them to lapi/fs.h or drop the claim from the
commit message.

---
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