NFS/NFSD/SUNRPC: replace generic creds with 'struct cred'.

SUNRPC has two sorts of credentials, both of which appear as
"struct rpc_cred".
There are "generic credentials" which are supplied by clients
such as NFS and passed in 'struct rpc_message' to indicate
which user should be used to authorize the request, and there
are low-level credentials such as AUTH_NULL, AUTH_UNIX, AUTH_GSS
which describe the credential to be sent over the wires.

This patch replaces all the generic credentials by 'struct cred'
pointers - the credential structure used throughout Linux.

For machine credentials, there is a special 'struct cred *' pointer
which is statically allocated and recognized where needed as
having a special meaning.  A look-up of a low-level cred will
map this to a machine credential.

Signed-off-by: NeilBrown <neilb@suse.com>
Acked-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

1 files changed, 4 insertions, 7 deletions

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index aea015743172..094775ea0781 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -950,13 +950,11 @@ struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
                                                 struct file *filp)
 {
         struct nfs_open_context *ctx;
-        struct rpc_cred *cred = rpc_lookup_cred();
-        if (IS_ERR(cred))
-                return ERR_CAST(cred);
+        const struct cred *cred = get_current_cred();
 
         ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
         if (!ctx) {
-                put_rpccred(cred);
+                put_cred(cred);
                 return ERR_PTR(-ENOMEM);
         }
         nfs_sb_active(dentry->d_sb);
@@ -998,8 +996,7 @@ static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
         }
         if (inode != NULL)
                 NFS_PROTO(inode)->close_context(ctx, is_sync);
-        if (ctx->cred != NULL)
-                put_rpccred(ctx->cred);
+        put_cred(ctx->cred);
         dput(ctx->dentry);
         nfs_sb_deactive(sb);
         put_rpccred(ctx->ll_cred);
@@ -1044,7 +1041,7 @@ EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
 /*
  * Given an inode, search for an open context with the desired characteristics
  */
-struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
+struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode)
 {
         struct nfs_inode *nfsi = NFS_I(inode);
         struct nfs_open_context *pos, *ctx = NULL;