With Kirill Korotaev <kk@sw.ru>

invalidate_inodes() can take a large amount of time searching the inode
lists for inodes which belong to this fs.  Add a separate list for this
search.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>