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NFS: move credential expiry tracking out of SUNRPC into NFS.

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NFS needs to know when a credential is about to expire so that
it can modify write-back behaviour to finish the write inside the
expiry time.
It currently uses functions in SUNRPC code which make use of a
fairly complex callback scheme and flags in the generic credientials.

As I am working to discard the generic credentials, this has to change.

This patch moves the logic into NFS, in part by finding and caching
the low-level credential in the open_context.  We then make direct
cred-api calls on that.

This makes the code much simpler and removes a dependency on generic
rpc credentials.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
NeilBrown
2018-12-03 11:30:30 +11:00
committed by Anna Schumaker
parent 1de7eea929
commit ddf529eeed
7 changed files with 28 additions and 124 deletions
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12
include/linux/sunrpc/auth.h
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@@ -37,17 +37,9 @@
struct rpcsec_gss_info;
/* auth_cred ac_flags bits */
enum {
RPC_CRED_KEY_EXPIRE_SOON = 1, /* underlying cred key will expire soon */
RPC_CRED_NOTIFY_TIMEOUT = 2, /* nofity generic cred when underlying
key will expire soon */
};
struct auth_cred {
const struct cred *cred;
const char *principal; /* If present, this is a machine credential */
unsigned long ac_flags;
};
/*
@@ -154,7 +146,6 @@ struct rpc_credops {
int (*crunwrap_resp)(struct rpc_task *, kxdrdproc_t,
void *, __be32 *, void *);
int (*crkey_timeout)(struct rpc_cred *);
bool (*crkey_to_expire)(struct rpc_cred *);
char * (*crstringify_acceptor)(struct rpc_cred *);
bool (*crneed_reencode)(struct rpc_task *);
};
@@ -198,9 +189,6 @@ int rpcauth_uptodatecred(struct rpc_task *);
int rpcauth_init_credcache(struct rpc_auth *);
void rpcauth_destroy_credcache(struct rpc_auth *);
void rpcauth_clear_credcache(struct rpc_cred_cache *);
int rpcauth_key_timeout_notify(struct rpc_auth *,
struct rpc_cred *);
bool rpcauth_cred_key_to_expire(struct rpc_auth *, struct rpc_cred *);
char * rpcauth_stringify_acceptor(struct rpc_cred *);
static inline