Attilio Rao - The VFS/vnode interface in the FreeBSD kernel

Описание: Abstract: The presentation is focused on historical and qualitative discussion of the VFS/vnode and how the FreeBSD kernel implements it. First, a small historical overview about the VFS/vnode interface is presented. Then its actual representation in the FreeBSD kernel, covering its main components (mount and vnode structures, syncer, vnlru daemon, buffer cache, namecache, relationship with neighbor objects like filedescs, struct files and bios). Finally, a summary is given about vfs/vnode races during their life-cycle and how they are handled practically within real-life filesystems implementations, with an eye to future development and things not done due to lack of time (exports, stacked filesystems, etc).