Pull cifs updates from Steve French:

 - four fixes for stable

 - improvements to DFS including allowing failover to alternate targets

 - some small performance improvements

* tag '4.21-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6: (39 commits)
  cifs: update internal module version number
  cifs: we can not use small padding iovs together with encryption
  cifs: Minor Kconfig clarification
  cifs: Always resolve hostname before reconnecting
  cifs: Add support for failover in cifs_reconnect_tcon()
  cifs: Add support for failover in smb2_reconnect()
  cifs: Only free DFS target list if we actually got one
  cifs: start DFS cache refresher in cifs_mount()
  cifs: Use GFP_ATOMIC when a lock is held in cifs_mount()
  cifs: Add support for failover in cifs_reconnect()
  cifs: Add support for failover in cifs_mount()
  cifs: remove set but not used variable 'sep'
  cifs: Make use of DFS cache to get new DFS referrals
  cifs: minor updates to documentation
  cifs: check kzalloc return
  cifs: remove set but not used variable 'server'
  cifs: Use kzfree() to free password
  cifs: Fix to use kmem_cache_free() instead of kfree()
  cifs: update for current_kernel_time64() removal
  cifs: Add DFS cache routines
  ...