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authorPavel Emelyanov <xemul@openvz.org>2008-07-25 01:47:07 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-25 10:53:37 -0700
commit4efd1a1b2f09a4b746dd9dc057986c6dadcb1317 (patch)
tree048b7c286be2f17efce9b3482d9618cd150ee3f7 /.gitignore
parente885dcde75685e09f23cffae1f6d5169c105b8a0 (diff)
devcgroup: relax white-list protection down to RCU
Currently this list is protected with a simple spinlock, even for reading from one. This is OK, but can be better. Actually I want it to be better very much, since after replacing the OpenVZ device permissions engine with the cgroup-based one I noticed, that we set 12 default device permissions for each newly created container (for /dev/null, full, terminals, ect devices), and people sometimes have up to 20 perms more, so traversing the ~30-40 elements list under a spinlock doesn't seem very good. Here's the RCU protection for white-list - dev_whitelist_item-s are added and removed under the devcg->lock, but are looked up in permissions checking under the rcu_read_lock. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Acked-by: Serge Hallyn <serue@us.ibm.com> Cc: Balbir Singh <balbir@in.ibm.com> Cc: Paul Menage <menage@google.com> Cc: "Paul E. McKenney" <paulmck@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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