[$] Trust in and maintenance of filesystems

The Linux kernel supports a wide variety of filesystems, many of which areno longer in heavy use - or, perhaps, any use at all. The kernel codeimplementing the less-popular filesystems tends to be relatively unpopularas well, receiving little in the way of maintenance. Keeping oldfilesystems alive does place a burden on kernel developers, though, so itis not surprising that there is pressure to remove the least popular ones.At the 2023 Kernel Maintainers Summit, the developers talked about thesefilesystems and what can be done about them.