overlayfs_set_fd

composefs::mountcompat

Function overlayfs_set_fd 

Source 
pub fn overlayfs_set_fd(
    fs_fd: BorrowedFd<'_>,
    key: &str,
    fd: BorrowedFd<'_>,
) -> Result<()>
Expand description

Sets one of the “dir” mount options on an overlayfs to the given file descriptor.

On RHEL9 kernels, file descriptors cannot be set directly, so this implementation uses fsconfig_set_string() with a /proc/self/fd/ path instead.