[LU-13874] lower than and greater than compare operator support for PCC rule

• Type: Improvement
• Resolution: Unresolved
• Priority: Minor
• Assignee: WC Triage
• Reporter: Qian Yingjin

Description

There are increasing requirements to add lower than/greater than compare operator for the PCC rules:

• File data that is larger than local disk capacity should not auto cache in PCC;
• A range of UID/GID/ProjID could be auto cached on PCC;

The following rule expressions are supported:

lctl pcc add /mnt/lustre /mnt/pcc -p "projid={100}&size>{1M}&size<{500G}"
lctl pcc add /mnt/lustre /mnt/pcc -p "projid>{100}&projid<{110}"
lctl pcc add /mnt/lustre /mnt/pcc -p "uid<{1500}&uid>{1000}"