Which Linux filesystem supports over 4 billion files?

Question

linux

Which Linux filesystem supports over 4 billion files?
How do the big "photo hosting companies" like Facebook do?

Answer 1

it all depends on the "length in bytes" of the UID of the file.
use filesystems with dynamic inode allocation (xfs zfs btrfs etc.) or use distributed filesystems.
the former are convenient for a single-server configuration.
the latter are convenient for multi-server systems (well, that's a no-brainer) By the
way, the latter do not always look like a full-fledged file system. as an option, a self-written file management system in the form of a database, which, by a unique file identifier, issues a URL where it can be found. and on servers, the local number of files fits into any framework.