Filesystems

• ubifs
• tmpfs
• ramfs
• rootfs

ramfs/rootfs

   * Source: fs/ramfs/*
         o filesystem types defined in inode.c
               + struct file_system_type ramfs_fs_type => ramfs
               + struct file_system_type rootfs_fs_type => rootfs
   * Documentation
         o
               + Documentation/filesystems/ramfs-rootfs-initramfs.txt
   * Patch
         o David Gibson created a patch to limit the usage of resource. However, Linus wanted to keep the ramfs as very simple, keeping it as an example code. If users need to limit the size of memory, use tmpfs instead.

tmpfs

   * Source: fs/tmpfs/*
   * Documentation
         o Documentation/filesystems/tmpfs.txt