LU-12682 llite: fake symlink type of foreign file/dir

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

diff --git a/lustre/include/uapi/linux/lustre/lustre_user.h b/lustre/include/uapi/linux/lustre/lustre_user.h
index a13306e..ac8a3d6 100644 (file)
--- a/lustre/include/uapi/linux/lustre/lustre_user.h
+++ b/lustre/include/uapi/linux/lustre/lustre_user.h
@@ -618,6 +618,7 @@ struct ll_ioc_lease_id {
 #define LL_IOC_LMV_GETSTRIPE           _IOWR('f', 241, struct lmv_user_md)
 #define LL_IOC_REMOVE_ENTRY            _IOWR('f', 242, __u64)
 #define LL_IOC_RMFID                   _IOR('f', 242, struct fid_array)
+#define LL_IOC_UNLOCK_FOREIGN          _IO('f', 242)
 #define LL_IOC_SET_LEASE               _IOWR('f', 243, struct ll_ioc_lease)
 #define LL_IOC_SET_LEASE_OLD           _IOWR('f', 243, long)
 #define LL_IOC_GET_LEASE               _IO('f', 244)
@@ -1072,7 +1073,7 @@ struct lustre_foreign_type {
  **/
 enum lustre_foreign_types {
        LU_FOREIGN_TYPE_NONE = 0,
-       LU_FOREIGN_TYPE_DAOS = 0xda05,
+       LU_FOREIGN_TYPE_SYMLINK = 0xda05,
        /* must be the max/last one */
        LU_FOREIGN_TYPE_UNKNOWN = 0xffffffff,
 };
@@ -2639,6 +2640,52 @@ struct fid_array {
 };
 #define OBD_MAX_FIDS_IN_ARRAY  4096
 
+/* more types could be defined upon need for more complex
+ * format to be used in foreign symlink LOV/LMV EAs, like
+ * one to describe a delimiter string and occurence number
+ * of delimited sub-string, ...
+ */
+enum ll_foreign_symlink_upcall_item_type {
+       EOB_TYPE = 1,
+       STRING_TYPE = 2,
+       POSLEN_TYPE = 3,
+};
+
+/* may need to be modified to allow for more format items to be defined, and
+ * like for ll_foreign_symlink_upcall_item_type enum
+ */
+struct ll_foreign_symlink_upcall_item {
+       __u32 type;
+       union {
+               struct {
+                       __u32 pos;
+                       __u32 len;
+               };
+               struct {
+                       size_t size;
+                       union {
+                               /* internal storage of constant string */
+                               char *string;
+                               /* upcall stores constant string in a raw */
+                               char bytestring[0];
+                       };
+               };
+       };
+};
+
+#define POSLEN_ITEM_SZ (offsetof(struct ll_foreign_symlink_upcall_item, len) + \
+               sizeof(((struct ll_foreign_symlink_upcall_item *)0)->len))
+#define STRING_ITEM_SZ(sz) ( \
+       offsetof(struct ll_foreign_symlink_upcall_item, bytestring) + \
+       (sz + sizeof(__u32) - 1) / sizeof(__u32) * sizeof(__u32))
+
+/* presently limited to not cause max stack frame size to be reached
+ * because of temporary automatic array of
+ * "struct ll_foreign_symlink_upcall_item" presently used in
+ * foreign_symlink_upcall_info_store()
+ */
+#define MAX_NB_UPCALL_ITEMS 32
+
 #if defined(__cplusplus)
 }
 #endif