[LU-16313] PCC: change PCC type with bit matching for attach

Tue, 6 Dec 2022 04:52:03 +0000

We only support two PCC type: readonly and readwirte:

enum lu_pcc_type {
    LU_PCC_NONE = 0,
    LU_PCC_READWRITE,
    LU_PCC_READONLY,
    LU_PCC_MAX
};
struct lu_pcc_attach {
    __u32 pcca_type; /* PCC type */
    __u32 pcca_id; /* archive ID for readwrite, group ID for readonly */
};

The attach data structure @lu_pcc_attach is using 32 bit @pcca_type to determine the type.

we could change it from "== LU_PCC_READWRITE" to "&LU_PCC_READWRITE" to determine the PCC type via 2 bit matching. The left bits can be used as other flags for PCC attach such the asynchronous attach via the command "lfs pcc attach -A".

Whamcloud Community JIRA

[LU-16313] PCC: change PCC type with bit matching for attach