David Howells <dhowells@xxxxxxxxxx> writes: > Steve French <smfrench@xxxxxxxxx> wrote: > >> For SMB3/CIFS mounts, Paulo added support last year for automatic >> reconnect if the IP address of the server changes. It also is helpful >> when DFS (global name space) addresses change. > > What happens if the IP address the superblock is going to changes, then > another mount is made back to the original IP address? Does the second mount > just pick the original superblock? It is going to transparently reconnect to the new ip address, SMB share, and cifs superblock is kept unchanged. We, however, update internal TCP_Server_Info structure to reflect new destination ip address. For the second mount, since the hostname (extracted out of the UNC path at mount time) resolves to a new ip address and that address was saved earlier in TCP_Server_Info structure during reconnect, we will end up reusing same cifs superblock as per fs/cifs/connect.c:cifs_match_super().
