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author | David Howells <dhowells@redhat.com> | 2008-11-14 10:39:17 +1100 |
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committer | James Morris <jmorris@namei.org> | 2008-11-14 10:39:17 +1100 |
commit | f1752eec6145c97163dbce62d17cf5d928e28a27 (patch) | |
tree | 16bc51166d38815092de36a461b845b0b4b522f9 /include/linux/cred.h | |
parent | b6dff3ec5e116e3af6f537d4caedcad6b9e5082a (diff) | |
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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.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/include/linux/cred.h b/include/linux/cred.h index 3e65587..a7a6860 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 */ |