This option enables standard file locking support, required for filesystems like NFS and for the flock() system call. Disabling this option saves about 11k.
Tmpfs is a file system which keeps all files in virtual memory. Everything in tmpfs is temporary in the sense that no files will be created on your hard drive. The files live in memory and swap space. If you unmount a tmpfs instance, everything stored therein is lost. See <file:Documentation/filesystems/tmpfs.txt> for details.
POSIX Access Control Lists (ACLs) support additional access rights for users and groups beyond the standard owner/group/world scheme, and this option selects support for ACLs specifically for tmpfs filesystems. If you've selected TMPFS, it's possible that you'll also need this option as there are a number of Linux distros that require POSIX ACL support under /dev for certain features to work properly. For example, some distros need this feature for ALSA-related /dev files for sound to work properly. In short, if you're not sure, say Y. To learn more about Access Control Lists, visit the POSIX ACLs for Linux website <http://acl.bestbits.at/>.
Extended attributes are name:value pairs associated with inodes by the kernel or by users (see the attr(5) manual page, or visit <http://acl.bestbits.at/> for details). Currently this enables support for the trusted.* and security.* namespaces. You need this for POSIX ACL support on tmpfs. If unsure, say N.
hugetlbfs is a filesystem backing for HugeTLB pages, based on ramfs. For architectures that support it, say Y here and read <file:Documentation/vm/hugetlbpage.txt> for details. If unsure, say N.
Say Y here to get to see options for various miscellaneous filesystems, such as filesystems that came from other operating systems. This option alone does not add any kernel code. If you say N, all options in this submenu will be skipped and disabled; if unsure, say Y here.
Say Y here to get to see options for network filesystems and filesystem-related networking code, such as NFS daemon and RPCSEC security modules. This option alone does not add any kernel code. If you say N, all options in this submenu will be skipped and disabled; if unsure, say Y here.