afs: Retain more of the VLDB record for alias detection

Save more bits from the volume location database record obtained for a
server so that we can use this information in cell alias detection.

Signed-off-by: David Howells <[e-mail]>

fs/afs/internal.h

···
 };
 
 /*
- * Replaceable server list.
+ * Replaceable volume server list.
  */
 struct afs_server_entry {
 	struct afs_server	*server;
···
 };
 
 struct afs_server_list {
+	afs_volid_t		vids[AFS_MAXTYPES]; /* Volume IDs */
 	refcount_t		usage;
 	unsigned char		nr_servers;
 	unsigned char		preferred;	/* Preferred server */

fs/afs/server_list.c

···
 	refcount_set(&slist->usage, 1);
 	rwlock_init(&slist->lock);
 
+	for (i = 0; i < AFS_MAXTYPES; i++)
+		slist->vids[i] = vldb->vid[i];
+
 	/* Make sure a records exists for each server in the list. */
 	for (i = 0; i < vldb->nr_servers; i++) {
 		if (!(vldb->fs_mask[i] & type_mask))