Backport #17675 to 2.3: linux: use sys/stat.h instead of linux/stat.h

[alex-moch]

glibc includes linux/stat.h for statx, but musl defines its own statx struct and associated constants, which does not include STATX_MNT_ID yet. Thus, including linux/stat.h directly should be avoided for maximum libc compatibility.

Tested on:

• glibc: x86_64, i686, aarch64, armv7l, armv6l
• musl: x86_64, aarch64, armv7l, armv6l

Reviewed-by: Brian Behlendorf behlendorf1@llnl.gov
Tested-By: Achill Gilgenast achill@achill.org

Closes #17675
(cherry picked from commit ccf5a8a)

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Motivation and Context

This fixes building ZFS v2.3 against the musl C library. Original commit message above.

Description

Changed to use sys/stat.h instead of linux/stat.h. This approach works correctly with both glibc and musl.

How Has This Been Tested?

• Clean cherry pick from the master branch: ccf5a8a.
• Patch is included in the Gentoo ebuild for ZFS.
  • Tested on ~arm64/llvm/musl/openrc.
  • Tested on arm64/gcc/glibc/systemd.

I am co-maintaining the sys-fs/zfs package on Gentoo and thus test against musl and LLVM toolchains.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Performance enhancement (non-breaking change which improves efficiency)
• Code cleanup (non-breaking change which makes code smaller or more readable)
• Quality assurance (non-breaking change which makes the code more robust against bugs)
• Breaking change (fix or feature that would cause existing functionality to change)
• Library ABI change (libzfs, libzfs_core, libnvpair, libuutil and libzfsbootenv)
• Documentation (a change to man pages or other documentation)

Checklist:

• My code follows the OpenZFS code style requirements.
• I have updated the documentation accordingly.
• I have read the contributing document.
• I have added tests to cover my changes.
• I have run the ZFS Test Suite with this change applied.
• All commit messages are properly formatted and contain Signed-off-by.