[LTP] syscalls/statx13: Add basic test for STATX_WRITE_ATOMIC on regular file

[linuxtestproject.agent@gmail.com]

Hi Gaurav,

On Fri, 16 Oct 2026, Gaurav Pathak wrote:
> syscalls/statx13: Add basic test for STATX_WRITE_ATOMIC on regular file

> +++ b/testcases/kernel/syscalls/statx/statx13.c
> +			.type = "xfs",
> +			.min_kver = "6.12",
> +			.mkfs_opts = (const char *const []){"-f", "-bsize=16K", NULL},

With 4 KiB pages and CONFIG_TRANSPARENT_HUGEPAGE disabled, XFS rejects
this 16 KiB filesystem with ENOSYS even on kernels newer than 6.12.
mapping_max_folio_size_supported() returns PAGE_SIZE in that configuration,
so SAFE_MOUNT2 reports TBROK before the statx checks run.
Use the default XFS block size, or gate the large-block configuration on
its actual prerequisites.

> + * This test validates the STATX_WRITE_ATOMIC feature (introduced in Linux 6.13).
> + * It ensures that supported filesystems (xfs and ext4) correctly report their
> + * atomic write limits to user space when queried via statx().
> + *
> + * Minimum Linux version required is v6.12.

STATX_WRITE_ATOMIC was introduced in 6.11 for block devices; regular-file
reporting on XFS/ext4 arrived in 6.13, so the stated 6.12 minimum is
incorrect. Describe the regular-file support explicitly, correct or remove
the minimum-version sentence, and use :manpage:`statx(2)` for the syscall
reference.

> +	.needs_root = 1,

Document in the high-level description that root is required to format
and mount the test filesystems.

Verdict - Needs revision

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