From 8b6a666a97544bf307190a05947742b8357aa962 Mon Sep 17 00:00:00 2001 From: David Howells Date: Mon, 20 May 2019 08:48:46 +0100 Subject: afs: Provide an RCU-capable key lookup Provide an RCU-capable key lookup function. We don't want to call afs_request_key() in RCU-mode pathwalk as request_key() might sleep, even if we don't ask it to construct anything as it might find a key that is currently undergoing construction. Signed-off-by: David Howells --- include/linux/key.h | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) (limited to 'include/linux/key.h') diff --git a/include/linux/key.h b/include/linux/key.h index 50028338a4cc..6cf8e71cf8b7 100644 --- a/include/linux/key.h +++ b/include/linux/key.h @@ -324,7 +324,7 @@ static inline struct key *request_key(struct key_type *type, } #ifdef CONFIG_NET -/* +/** * request_key_net - Request a key for a net namespace and wait for construction * @type: Type of key. * @description: The searchable description of the key. @@ -341,6 +341,18 @@ static inline struct key *request_key(struct key_type *type, */ #define request_key_net(type, description, net, callout_info) \ request_key_tag(type, description, net->key_domain, callout_info); + +/** + * request_key_net_rcu - Request a key for a net namespace under RCU conditions + * @type: Type of key. + * @description: The searchable description of the key. + * @net: The network namespace that is the key's domain of operation. + * + * As for request_key_rcu() except that only keys that operate the specified + * network namespace are used. + */ +#define request_key_net_rcu(type, description, net) \ + request_key_rcu(type, description, net->key_domain); #endif /* CONFIG_NET */ extern int wait_for_key_construction(struct key *key, bool intr); -- cgit v1.2.3