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authorSerge E. Hallyn <serge.hallyn@canonical.com>2011-05-13 04:27:54 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2011-05-13 11:45:33 -0700
commit47a150edc2ae734c0f4bf50aa19499e23b9a46f8 (patch)
treebeeba9befd531285f663559a76f6f0f7378a6c2b /include/linux/capability.h
parent381e7863d94891035a1a6b7836e9db72f9f1cba1 (diff)
downloadlinux-linaro-stable-47a150edc2ae734c0f4bf50aa19499e23b9a46f8.tar.gz
Cache user_ns in struct cred
If !CONFIG_USERNS, have current_user_ns() defined to (&init_user_ns). Get rid of _current_user_ns. This requires nsown_capable() to be defined in capability.c rather than as static inline in capability.h, so do that. Request_key needs init_user_ns defined at current_user_ns if !CONFIG_USERNS, so forward-declare that in cred.h if !CONFIG_USERNS at current_user_ns() define. Compile-tested with and without CONFIG_USERNS. Signed-off-by: Serge E. Hallyn <serge.hallyn@canonical.com> [ This makes a huge performance difference for acl_permission_check(), up to 30%. And that is one of the hottest kernel functions for loads that are pathname-lookup heavy. ] Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/capability.h')
-rw-r--r--include/linux/capability.h13
1 files changed, 1 insertions, 12 deletions
diff --git a/include/linux/capability.h b/include/linux/capability.h
index 16ee8b49a200..d4675af963fa 100644
--- a/include/linux/capability.h
+++ b/include/linux/capability.h
@@ -546,18 +546,7 @@ extern bool has_capability_noaudit(struct task_struct *t, int cap);
extern bool capable(int cap);
extern bool ns_capable(struct user_namespace *ns, int cap);
extern bool task_ns_capable(struct task_struct *t, int cap);
-
-/**
- * nsown_capable - Check superior capability to one's own user_ns
- * @cap: The capability in question
- *
- * Return true if the current task has the given superior capability
- * targeted at its own user namespace.
- */
-static inline bool nsown_capable(int cap)
-{
- return ns_capable(current_user_ns(), cap);
-}
+extern bool nsown_capable(int cap);
/* audit system wants to get cap info from files as well */
extern int get_vfs_caps_from_disk(const struct dentry *dentry, struct cpu_vfs_cap_data *cpu_caps);