[PATCH 0/3] [focal/linux-azure] Backport CIFS updates

[Tim Gardner]

BugLink: https://bugs.launchpad.net/bugs/1960549

SRU Justification

[Impact]

Microsoft is asking to have 3 CIFS patches backported to focal/linux-azure.

506c1da44fee32ba1d3a70413289ad58c772bba6 ("cifs: use the expiry output of dns_query to schedule next resolution")
4ac0536f8874a903a72bddc57eb88db774261e3a ("cifs: set a minimum of 120s for next dns resolution")
7be3248f313930ff3d3436d4e9ddbe9fccc1f541 ("cifs: To match file servers, make sure the server hostname matches")

This is a second attempt because the first backport attempt caused a regression. This set has been thoroughly
tested by Microsoft, especially for the case that was causing the regression (DFS enabled shares).

[Where things could go wrong]

Share connection attempts could fail. DFS shares could cause kernel panics.

[Other Info]

SF: #00324495