In demonstrating one of the gaps of man pages in modern times and likely having hindered the adoption of the Linux kernel's new mount API, it took more than six years for those system calls to be properly documented within man pages. The Linux "new" mount API was introduced back in mid-2019 with Linux 5.2 and since supported by key file-systems after several years but not until weeks ago was this file descriptor based mount API scoped out within man pages.

The "new" mount API for Linux is a set of system calls like fsopen and fsconfig for offering more flexibility than the Linux kernel's long-used mount system call that is a one-shot approach compared to this modern multi-step design for better flexibility. In the kernels since Linux 5.2, various file-systems have transitioned to supporting the modern mount API. It was only earlier this year that F2FS added support for it as one of the last major file-systems without it.