overlayfs: implement POSIX ACLs - #13909
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Implements POSIX ACLs for gVisor's overlayfs. - Adds plumbing to keep access and default ACLs in sync with the underlying filesystems, simliar to mode - Moves permission/filetype checking into helpers in posix_acl.go, used by both tmpfs and overlayfs - Updates the POSIX ACL tests to be parametrized by filesystem. The existing acl test suite runs both on overlayfs and on tmpfs This fixes journald not working for systemd user services.
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Implements POSIX ACLs for gVisor's overlayfs.
This fixes journald not working for systemd user services.