HelenOS sources

uspace/lib/c/include/ipc/vfs.h
uspace/lib/c/include/vfs/vfs.h
uspace/lib/posix/include/libc/ipc/vfs.h
uspace/lib/posix/include/libc/vfs/vfs.h
uspace/srv/vfs/vfs.h
HelenOS homepage, sources at GitHub