CRED: Use creds in file structs

Attach creds to file structs and discard f_uid/f_gid.

file_operations::open() methods (such as hppfs_open()) should use file->f_cred
rather than current_cred().  At the moment file->f_cred will be current_cred()
at this point.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: James Morris <jmorris@namei.org>
Signed-off-by: James Morris <jmorris@namei.org>
diff --git a/net/netfilter/xt_owner.c b/net/netfilter/xt_owner.c
index f19ebd9..22b2a5e 100644
--- a/net/netfilter/xt_owner.c
+++ b/net/netfilter/xt_owner.c
@@ -34,12 +34,12 @@
 		return false;
 
 	if (info->match & IPT_OWNER_UID)
-		if ((filp->f_uid != info->uid) ^
+		if ((filp->f_cred->fsuid != info->uid) ^
 		    !!(info->invert & IPT_OWNER_UID))
 			return false;
 
 	if (info->match & IPT_OWNER_GID)
-		if ((filp->f_gid != info->gid) ^
+		if ((filp->f_cred->fsgid != info->gid) ^
 		    !!(info->invert & IPT_OWNER_GID))
 			return false;
 
@@ -60,12 +60,12 @@
 		return false;
 
 	if (info->match & IP6T_OWNER_UID)
-		if ((filp->f_uid != info->uid) ^
+		if ((filp->f_cred->fsuid != info->uid) ^
 		    !!(info->invert & IP6T_OWNER_UID))
 			return false;
 
 	if (info->match & IP6T_OWNER_GID)
-		if ((filp->f_gid != info->gid) ^
+		if ((filp->f_cred->fsgid != info->gid) ^
 		    !!(info->invert & IP6T_OWNER_GID))
 			return false;
 
@@ -93,14 +93,14 @@
 		       (XT_OWNER_UID | XT_OWNER_GID)) == 0;
 
 	if (info->match & XT_OWNER_UID)
-		if ((filp->f_uid >= info->uid_min &&
-		    filp->f_uid <= info->uid_max) ^
+		if ((filp->f_cred->fsuid >= info->uid_min &&
+		    filp->f_cred->fsuid <= info->uid_max) ^
 		    !(info->invert & XT_OWNER_UID))
 			return false;
 
 	if (info->match & XT_OWNER_GID)
-		if ((filp->f_gid >= info->gid_min &&
-		    filp->f_gid <= info->gid_max) ^
+		if ((filp->f_cred->fsgid >= info->gid_min &&
+		    filp->f_cred->fsgid <= info->gid_max) ^
 		    !(info->invert & XT_OWNER_GID))
 			return false;