[CIFS] remove unused list, add new cifs sock list to prepare for mount/umount fix

Also adds two lines missing from the previous patch (for the need reconnect flag in the
/proc/fs/cifs/DebugData handling)

The new global_cifs_sock_list is added, and initialized in init_cifs but not used yet.
Jeff Layton will be adding code in to use that and to remove the GlobalTcon and GlobalSMBSession
lists.

CC: Jeff Layton <[e-mail]>
CC: Shirish Pargaonkar <[e-mail]>
Signed-off-by: Steve French <[e-mail]>

fs/cifs/cifs_debug.c

···
 		else
 			seq_printf(m, " type: %d ", dev_type);
 
-		if (tcon->tidStatus == CifsNeedReconnect)
+		if (tcon->need_reconnect)
 			seq_puts(m, "\tDISCONNECTED ");
 	}
 	read_unlock(&GlobalSMBSeslock);
···
 		i++;
 		tcon = list_entry(tmp, struct cifsTconInfo, cifsConnectionList);
 		seq_printf(m, "\n%d) %s", i, tcon->treeName);
-		if (tcon->tidStatus == CifsNeedReconnect)
+		if (tcon->need_reconnect)
 			seq_puts(m, "\tDISCONNECTED ");
 		seq_printf(m, "\nSMBs: %d Oplock Breaks: %d",
 			atomic_read(&tcon->num_smbs_sent),

fs/cifs/cifsfs.c

···
 {
 	int rc = 0;
 	cifs_proc_init();
-/*	INIT_LIST_HEAD(&GlobalServerList);*/	/* BB not implemented yet */
-	INIT_LIST_HEAD(&GlobalSMBSessionList);
-	INIT_LIST_HEAD(&GlobalTreeConnectionList);
+	INIT_LIST_HEAD(&global_cifs_sock_list);
+	INIT_LIST_HEAD(&GlobalSMBSessionList); /* BB to be removed by jl */
+	INIT_LIST_HEAD(&GlobalTreeConnectionList); /* BB to be removed by jl */
 	INIT_LIST_HEAD(&GlobalOplock_Q);
 #ifdef CONFIG_CIFS_EXPERIMENTAL
 	INIT_LIST_HEAD(&GlobalDnotifyReqList);

fs/cifs/cifsglob.h

···
 #define GLOBAL_EXTERN extern
 #endif
 
-/*
- * The list of servers that did not respond with NT LM 0.12.
- * This list helps improve performance and eliminate the messages indicating
- * that we had a communications error talking to the server in this list.
- */
-/* Feature not supported */
-/* GLOBAL_EXTERN struct servers_not_supported *NotSuppList; */
 
-/*
- * The following is a hash table of all the users we know about.
- */
-GLOBAL_EXTERN struct smbUidInfo *GlobalUidList[UID_HASH];
-
-/* GLOBAL_EXTERN struct list_head GlobalServerList; BB not implemented yet */
-GLOBAL_EXTERN struct list_head GlobalSMBSessionList;
-GLOBAL_EXTERN struct list_head GlobalTreeConnectionList;
+/* the list of TCP_Server_Info structures, ie each of the sockets
+ * connecting our client to a distinct server (ip address), is
+ * chained together by global_cifs_sock_list. The list of all our SMB
+ * sessions (and from that the tree connections) can be found
+ * by iterating over global_cifs_sock_list */
+GLOBAL_EXTERN struct list_head global_cifs_sock_list;
+GLOBAL_EXTERN struct list_head GlobalSMBSessionList; /* BB to be removed by jl*/
+GLOBAL_EXTERN struct list_head GlobalTreeConnectionList; /* BB to be removed */
 GLOBAL_EXTERN rwlock_t GlobalSMBSeslock;  /* protects list inserts on 3 above */
 
 GLOBAL_EXTERN struct list_head GlobalOplock_Q;