Merge commits to v4.19 from 4.20 & 5.6 for cifs backupid fixes

[Vidhesh Ramesh]

Hi Steve,

We mount cifs shares on our centos machines running kernel v4.19 using backupoperator privileges using backupid, however we do not see that the backup intent is used for all calls. We did find fixes for them in 4.20 & 5.6 but not in 4.19. Would it be able to merge these commits to 4.19 as well ?

Here are the commits of interest.
1. https://github.com/torvalds/linux/commit/5e19697b56a64004e2d0ff1bb952ea05493c088f - v4.19.rc1
2. https://github.com/torvalds/linux/commit/61351d6d54e651ec4098445afa5ddc2092c4741a - v4.20.rc1
3. https://github.com/torvalds/linux/commit/4d5bdf28690a304e089ce750efc8b7dd718945c7 - v4.20.rc1
4. https://github.com/torvalds/linux/commit/0f060936e490c6279dfe773d75d526d3d3d77111 - v5.6-rc1

Vidhesh Ramesh