LU-10114 hsm: increase upper limit of maximum HSM backends registered with MDT

[fs/lustre-release.git] / lustre / include / uapi / linux / lustre / lustre_kernelcomm.h

diff --git a/lustre/include/uapi/linux/lustre/lustre_kernelcomm.h b/lustre/include/uapi/linux/lustre/lustre_kernelcomm.h
index e8119f5..26819ff 100644 (file)
--- a/lustre/include/uapi/linux/lustre/lustre_kernelcomm.h
+++ b/lustre/include/uapi/linux/lustre/lustre_kernelcomm.h
@@ -73,17 +73,26 @@ enum kuc_generic_message_type {
 #define KUC_GRP_HSM    0x02
 #define KUC_GRP_MAX    KUC_GRP_HSM
 
-#define LK_FLG_STOP 0x01
+enum lk_flags {
+       LK_FLG_STOP     = 0x0001,
+       LK_FLG_DATANR   = 0x0002,
+};
 #define LK_NOFD -1U
 
-/* kernelcomm control structure, passed from userspace to kernel */
+/* kernelcomm control structure, passed from userspace to kernel.
+ * For compatibility with old copytools, users who pass ARCHIVE_IDs
+ * to kernel using lk_data_count and lk_data should fill lk_flags with
+ * LK_FLG_DATANR. Otherwise kernel will take lk_data_count as bitmap of
+ * ARCHIVE IDs.
+ */
 struct lustre_kernelcomm {
        __u32 lk_wfd;
        __u32 lk_rfd;
        __u32 lk_uid;
        __u32 lk_group;
-       __u32 lk_data;
+       __u32 lk_data_count;
        __u32 lk_flags;
+       __u32 lk_data[0];
 } __attribute__((packed));
 
 #endif /* __UAPI_KERNELCOMM_H__ */