fsimpl/gofer/tmpfs: Support statx btime#13290
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gVisor did not report valid statx btime: gofer/directfs used fstat(2), which has no btime, and tmpfs did not track creation time. Use host statx(AT_EMPTY_PATH) for gofer/directfs metadata. Restrict host statx in gofer/sandbox seccomp filters to FD-only calls using a fixed empty path and AT_EMPTY_PATH. Track optional STATX_BTIME availability so filesystems without btime support do not expose zero btime. For tmpfs, initialize btime at inode creation and report STATX_BTIME, matching Linux >= 5.18. Reference: fs/stat.c:vfs_statx(), mm/shmem.c:shmem_getattr() Co-authored-by: Ayush Ranjan <ayushranjan@google.com> FUTURE_COPYBARA_INTEGRATE_REVIEW=#13038 from tanyifeng:fsimpl-statx-btime 4c56998 PiperOrigin-RevId: 921686588
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fsimpl/gofer/tmpfs: Support statx btime
gVisor did not report valid statx btime: gofer/directfs used fstat(2), which has no btime, and tmpfs did not track creation time.
Use host statx(AT_EMPTY_PATH) for gofer/directfs metadata. Restrict host statx in gofer/sandbox seccomp filters to FD-only calls using a fixed empty path and AT_EMPTY_PATH.
Track optional STATX_BTIME availability so filesystems without btime support do not expose zero btime. For tmpfs, initialize btime at inode creation and report STATX_BTIME, matching Linux >= 5.18.
Reference: fs/stat.c:vfs_statx(), mm/shmem.c:shmem_getattr()
Co-authored-by: Ayush Ranjan ayushranjan@google.com
FUTURE_COPYBARA_INTEGRATE_REVIEW=#13038 from tanyifeng:fsimpl-statx-btime 4c56998