[lustre-devel] [PATCH 08/42] lustre: pcc: use two bits to indicate pcc type for attach

From: Qian Yingjin <[email protected]>

PCC currenty supports two types: readwrite and readonly.
The attach data structure @lu_pcc_attach is using 32 bit value to
indicate the PCC type:
    struct lu_pcc_attach {
        __u32 pcca_type;
        __u32 pcca_id;
    };

In this patch, it changes to use 2 bits to represent the PCC type.
The left bits in @pcca_type can be used as flags for attach such
as a flag to indicate using the asynchronous attach via the
command "lfs pcc attach -A" for PCCRO.

WC-bug-id: https://jira.whamcloud.com/browse/LU-16313
Lustre-commit: 6e90974b1f4ac24c5 ("LU-16313 pcc: use two bits to indicate pcc type for attach")
Signed-off-by: Qian Yingjin <[email protected]>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/49160
Reviewed-by: Andreas Dilger <[email protected]>
Reviewed-by: Feng Lei <[email protected]>
Reviewed-by: Oleg Drokin <[email protected]>
Signed-off-by: James Simmons <[email protected]>
---
 include/uapi/linux/lustre/lustre_user.h | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/include/uapi/linux/lustre/lustre_user.h b/include/uapi/linux/lustre/lustre_user.h
index e97ccb0635ba..c2096ba1cdbe 100644
--- a/include/uapi/linux/lustre/lustre_user.h
+++ b/include/uapi/linux/lustre/lustre_user.h
@@ -2324,18 +2324,22 @@ struct lu_heat {
 };
 
 enum lu_pcc_type {
-	LU_PCC_NONE = 0,
-	LU_PCC_READWRITE,
+	LU_PCC_NONE		= 0x0,
+	LU_PCC_READWRITE	= 0x01,
+	LU_PCC_READONLY		= 0x02,
+	LU_PCC_TYPE_MASK	= LU_PCC_READWRITE | LU_PCC_READONLY,
 	LU_PCC_MAX
 };
 
 static inline const char *pcc_type2string(enum lu_pcc_type type)
 {
-	switch (type) {
+	switch (type & LU_PCC_TYPE_MASK) {
 	case LU_PCC_NONE:
 		return "none";
 	case LU_PCC_READWRITE:
 		return "readwrite";
+	case LU_PCC_READONLY:
+		return "readonly";
 	default:
 		return "fault";
 	}
-- 
2.27.0

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