tree 9292ebc9bb6a21b364a97a44d1b6857a565159c5
parent 3e880fb5e4bb6a012035e3edd0586ee2817c2e24
author Nick Piggin <npiggin@kernel.dk> 1294382960 +1100
committer Nick Piggin <npiggin@kernel.dk> 1294383017 +1100

cgroup fs: avoid switching ->d_op on live dentry

Switching d_op on a live dentry is racy in general, so avoid it. In this case
it is a negative dentry, which is safer, but there are still concurrent ops
which may be called on d_op in that case (eg. d_revalidate). So in general
a filesystem may not do this. Fix cgroupfs so as not to do this.

Signed-off-by: Nick Piggin <npiggin@kernel.dk>