afs: Remove callback details from afs_callback_break struct

Remove unnecessary details of a broken callback, such as version, expiry
and type, from the afs_callback_break struct as they're not actually used
and make the list take more memory.
Signed-off-by: David Howells <dhowells@redhat.com>

fs/afs/afs.h

@@ -75,7 +75,7 @@ struct afs_callback {
 
 struct afs_callback_break {
 	struct afs_fid		fid;		/* File identifier */
-	struct afs_callback	cb;		/* Callback details */
+	//struct afs_callback	cb;		/* Callback details */
 };
 
 #define AFSCBMAX 50	/* maximum callbacks transferred per bulk op */

fs/afs/callback.c

@@ -310,14 +310,10 @@ void afs_break_callbacks(struct afs_server *server, size_t count,
 	/* TODO: Sort the callback break list by volume ID */
 
 	for (; count > 0; callbacks++, count--) {
-		_debug("- Fid { vl=%08llx n=%llu u=%u }  CB { v=%u x=%u t=%u }",
+		_debug("- Fid { vl=%08llx n=%llu u=%u }",
 		       callbacks->fid.vid,
 		       callbacks->fid.vnode,
-		       callbacks->fid.unique,
-		       callbacks->cb.version,
-		       callbacks->cb.expiry,
-		       callbacks->cb.type
-		       );
+		       callbacks->fid.unique);
 		afs_break_one_callback(server, &callbacks->fid);
 	}
 

fs/afs/cmservice.c

@@ -218,7 +218,6 @@ static int afs_deliver_cb_callback(struct afs_call *call)
 			cb->fid.vid	= ntohl(*bp++);
 			cb->fid.vnode	= ntohl(*bp++);
 			cb->fid.unique	= ntohl(*bp++);
-			cb->cb.type	= AFSCM_CB_UNTYPED;
 		}
 
 		afs_extract_to_tmp(call);
@@ -236,24 +235,18 @@ static int afs_deliver_cb_callback(struct afs_call *call)
 		if (call->count2 != call->count && call->count2 != 0)
 			return afs_protocol_error(call, -EBADMSG,
 						  afs_eproto_cb_count);
-		afs_extract_to_buf(call, call->count2 * 3 * 4);
+		call->_iter = &call->iter;
+		iov_iter_discard(&call->iter, READ, call->count2 * 3 * 4);
 		call->unmarshall++;
 
 	case 4:
-		_debug("extract CB array");
+		_debug("extract discard %zu/%u",
+		       iov_iter_count(&call->iter), call->count2 * 3 * 4);
+
 		ret = afs_extract_data(call, false);
 		if (ret < 0)
 			return ret;
 
-		_debug("unmarshall CB array");
-		cb = call->request;
-		bp = call->buffer;
-		for (loop = call->count2; loop > 0; loop--, cb++) {
-			cb->cb.version	= ntohl(*bp++);
-			cb->cb.expiry	= ntohl(*bp++);
-			cb->cb.type	= ntohl(*bp++);
-		}
-
 		call->unmarshall++;
 	case 5:
 		break;