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afs: Provide an RCU-capable key lookup

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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 <dhowells@redhat.com>
This commit is contained in:
David Howells
2019-05-20 08:48:46 +01:00
parent 23a289137a
commit 8b6a666a97
3 changed files with 45 additions and 3 deletions
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14
include/linux/key.h
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@@ -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);