cifs: Send a logoff request before removing a smb session
Send a smb session logoff request before removing smb session off of the list. On a signed smb session, remvoing a session off of the list before sending a logoff request results in server returning an error for lack of smb signature. Never seen an error during smb logoff, so as per MS-SMB2 3.2.5.1, not sure how an error during logoff should be retried. So for now, if a server returns an error to a logoff request, log the error and remove the session off of the list. Signed-off-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com> Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
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