tree d66b5037baec1e73674d20c179221f90ace84431
parent 2f83a53a81f5695b0f13635d411cd78367e547d6
author Linus Torvalds <torvalds@linux-foundation.org> 1472767009 -0700
committer David S. Miller <davem@davemloft.net> 1473020969 -0700

Revert "af_unix: Fix splice-bind deadlock"

This reverts commit c845acb324aa85a39650a14e7696982ceea75dc1.

It turns out that it just replaces one deadlock with another one: we can
still get the wrong lock ordering with the readlock due to overlayfs
calling back into the filesystem layer and still taking the vfs locks
after the readlock.

The proper solution ends up being to just split the readlock into two
pieces: the bind lock (taken *outside* the vfs locks) and the IO lock
(taken *inside* the filesystem locks).  The two locks are independent
anyway.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Reviewed-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>