[PATCH] knfsd: nfsd4: acls: fix handling of zero-length acls

It is legal to have zero-length NFSv4 acls; they just deny everything.

Also, nfs4_acl_nfsv4_to_posix will always return with pacl and dpacl set on
success, so the caller doesn't need to check this.
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/nfsd/nfs4acl.c

@@ -357,33 +357,20 @@ nfs4_acl_nfsv4_to_posix(struct nfs4_acl *acl, struct posix_acl **pacl,
 		goto out;
 
 	error = nfs4_acl_split(acl, dacl);
-	if (error < 0)
+	if (error)
 		goto out_acl;
 
-	if (acl->naces == 0) {
-		error = -ENODATA;
-		goto try_dpacl;
-	}
-
 	*pacl = _nfsv4_to_posix_one(acl, flags);
 	if (IS_ERR(*pacl)) {
 		error = PTR_ERR(*pacl);
 		*pacl = NULL;
 		goto out_acl;
 	}
-try_dpacl:
-	if (dacl->naces == 0) {
-		if (pacl == NULL || *pacl == NULL)
-			error = -ENODATA;
-		goto out_acl;
-	}
 
-	error = 0;
 	*dpacl = _nfsv4_to_posix_one(dacl, flags);
 	if (IS_ERR(*dpacl)) {
 		error = PTR_ERR(*dpacl);
 		*dpacl = NULL;
-		goto out_acl;
 	}
 out_acl:
 	if (error) {

fs/nfsd/vfs.c

@@ -447,13 +447,11 @@ nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 	} else if (error < 0)
 		goto out_nfserr;
 
-	if (pacl) {
 	error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS);
 	if (error < 0)
 		goto out_nfserr;
-	}
 
-	if (dpacl) {
+	if (S_ISDIR(inode->i_mode)) {
 		error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT);
 		if (error < 0)
 			goto out_nfserr;