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authorDavid Howells <dhowells@redhat.com>2008-11-14 10:39:17 +1100
committerJames Morris <jmorris@namei.org>2008-11-14 10:39:17 +1100
commitf1752eec6145c97163dbce62d17cf5d928e28a27 (patch)
tree16bc51166d38815092de36a461b845b0b4b522f9 /include/linux/cred.h
parentb6dff3ec5e116e3af6f537d4caedcad6b9e5082a (diff)
downloadlinux-f1752eec6145c97163dbce62d17cf5d928e28a27.tar.gz
CRED: Detach the credentials from task_struct
Detach the credentials from task_struct, duplicating them in copy_process() and releasing them in __put_task_struct(). Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: James Morris <jmorris@namei.org> Acked-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'include/linux/cred.h')
-rw-r--r--include/linux/cred.h29
1 files changed, 29 insertions, 0 deletions
diff --git a/include/linux/cred.h b/include/linux/cred.h
index 3e65587a72e..a7a686074cb 100644
--- a/include/linux/cred.h
+++ b/include/linux/cred.h
@@ -158,4 +158,33 @@ do { \
*(_gid) = current->cred->fsgid; \
} while(0)
+extern void __put_cred(struct cred *);
+extern int copy_creds(struct task_struct *, unsigned long);
+
+/**
+ * get_cred - Get a reference on a set of credentials
+ * @cred: The credentials to reference
+ *
+ * Get a reference on the specified set of credentials. The caller must
+ * release the reference.
+ */
+static inline struct cred *get_cred(struct cred *cred)
+{
+ atomic_inc(&cred->usage);
+ return cred;
+}
+
+/**
+ * put_cred - Release a reference to a set of credentials
+ * @cred: The credentials to release
+ *
+ * Release a reference to a set of credentials, deleting them when the last ref
+ * is released.
+ */
+static inline void put_cred(struct cred *cred)
+{
+ if (atomic_dec_and_test(&(cred)->usage))
+ __put_cred(cred);
+}
+
#endif /* _LINUX_CRED_H */