Re: linux-next: manual merge of the vfs tree with the overlayfs tree

[Al Viro]

On Mon, May 02, 2016 at 02:08:39AM +0100, Al Viro wrote:

> Should use lookup_one_len_unlocked(), actually.  lookup_hash() is
> a microoptimization, losing a lot more on excessive i_mutex contention.
> Either variant works, though.

PS: if anybody has a better name for lookup_one_len_unlocked(), I'll gladly
rename it; the thing hadn't been in the kernel for too long and the name is
somewhat confusing.  It's an equivalent of
	inode_lock()
	lookup_one_len()
	inode_unlock()
except that it avoids taking the lock when it's not needed.