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SUNRPC: Add a helper rpcauth_lookup_generic_cred()

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The NFSv4 protocol allows clients to negotiate security protocols on the
fly in the case where an administrator on the server changes the export
settings and/or in the case where we may have a filesystem migration event.

Instead of having the NFS client code cache credentials that are tied to a
particular AUTH method it is therefore preferable to have a generic credential
that can be converted into whatever AUTH is in use by the RPC client when
the read/write/sillyrename/... is put on the wire.

We do this by means of the new "generic" credential, which basically just
caches the minimal information that is needed to look up an RPCSEC_GSS,
AUTH_SYS, or AUTH_NULL credential.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust
2008-03-12 12:25:28 -04:00
parent 5c691044ec
commit 98a8e32394
5 changed files with 7 additions and 8 deletions
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8
fs/nfs/nfs4proc.c
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@@ -1408,7 +1408,7 @@ nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
BUG_ON(nd->intent.open.flags & O_CREAT);
}
cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
cred = rpc_lookup_cred();
if (IS_ERR(cred))
return (struct dentry *)cred;
parent = dentry->d_parent;
@@ -1443,7 +1443,7 @@ nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, st
struct rpc_cred *cred;
struct nfs4_state *state;
cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
cred = rpc_lookup_cred();
if (IS_ERR(cred))
return PTR_ERR(cred);
state = nfs4_do_open(dir, &path, openflags, NULL, cred);
@@ -1660,7 +1660,7 @@ nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
nfs_fattr_init(fattr);
cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
cred = rpc_lookup_cred();
if (IS_ERR(cred))
return PTR_ERR(cred);
@@ -1896,7 +1896,7 @@ nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
struct rpc_cred *cred;
int status = 0;
cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
cred = rpc_lookup_cred();
if (IS_ERR(cred)) {
status = PTR_ERR(cred);
goto out;