+} admin_pingop;
+
+typedef struct admin_service {
+ sym_base _b; /* Hash table base structure */
+ char *version; /* The provided version */
+ struct admin *prov; /* Which client provides me */
+ struct admin_service *next, *prev; /* Client's list of services */
+} admin_service;
+
+typedef struct admin_svcop {
+ admin_bgop bg; /* Background operation header */
+ struct admin *prov; /* Client servicing this job */
+ unsigned short index; /* This job's index */
+ struct admin_svcop *next, *prev; /* Links for provider's jobs */
+} admin_svcop;
+
+typedef struct admin_jobentry {
+ unsigned short seq; /* Zero if unused */
+ union {
+ admin_svcop *op; /* Operation, if slot in use, ... */
+ uint32 next; /* ... or index of next free slot */
+ } u;
+} admin_jobentry;
+
+typedef struct admin_jobtable {
+ uint32 n, sz; /* Used slots and table size */
+ admin_svcop *active; /* List of active jobs */
+ uint32 free; /* Index of first free slot */
+ admin_jobentry *v; /* And the big array of entries */
+} admin_jobtable;