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NFS: Fix up nfs_ctx_key_to_expire()

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If the cached credential exists but doesn't have any expiration callback
then exit early.
Fix up atomicity issues when replacing the credential with a new one
since the existing code could lead to refcount leaks.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2021-07-10 18:07:14 -04:00
parent 9019fb391d
commit ca05cbae2a
3 changed files with 31 additions and 16 deletions
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2
include/linux/nfs_fs.h
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@ -81,7 +81,7 @@ struct nfs_open_context {
fl_owner_t flock_owner;
struct dentry *dentry;
const struct cred *cred;
struct rpc_cred *ll_cred; /* low-level cred - use to check for expiry */
struct rpc_cred __rcu *ll_cred; /* low-level cred - use to check for expiry */
struct nfs4_state *state;
fmode_t mode;