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root(3) [plan9 man page]

ROOT(3) 						     Library Functions Manual							   ROOT(3)

root - the root file system SYNOPSIS
/ /boot /dev /env /proc /net DESCRIPTION
The syntax is illegal, so this device can only be accessed directly by the kernel. This device is set up by the kernel to be the root of the name space. The names in the one-level tree are mostly just place-holders, to allow a place to bind(2) to. The exception is /boot, which provides executable code when read. The kernel does an exec(2) of /boot when initializing. SOURCE
/sys/src/9/port/devroot.c ROOT(3)

Check Out this Related Man Page

SYSTEMD-VOLATILE-ROOT.SERVICE(8)			   systemd-volatile-root.service			  SYSTEMD-VOLATILE-ROOT.SERVICE(8)

systemd-volatile-root.service, systemd-volatile-root - Make the root file system volatile SYNOPSIS
systemd-volatile-root.service /lib/systemd/systemd-volatile-root DESCRIPTION
systemd-volatile-root.service is a service that replaces the root directory with a volatile memory file system ("tmpfs"), mounting the original (non-volatile) /usr inside it read-only. This way, vendor data from /usr is available as usual, but all configuration data in /etc, all state data in /var and all other resources stored directly under the root directory are reset on boot and lost at shutdown, enabling fully stateless systems. This service is only enabled if full volatile mode is selected, for example by specifying "systemd.volatile=yes" on the kernel command line. This service runs only in the initial RAM disk ("initrd"), before the system transitions to the host's root directory. Note that this service is not used if "systemd.volatile=state" is used, as in that mode the root directory is non-volatile. SEE ALSO
systemd(1), systemd-fstab-generator(8), kernel-command-line(7) systemd 237 SYSTEMD-VOLATILE-ROOT.SERVICE(8)
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