DAOS-16445 client: Try cycling different method

We've noticed that with 8GB files we fill space pretty quickly.

Just trying another method to see if it works any better.

Required-githooks: true

Signed-off-by: Jeff Olivier <jeffolivier@google.com>

src/client/dfs/dfs_internal.h

@@ -102,6 +102,15 @@
 /** MAX value for the HI OID */
 #define MAX_OID_HI         ((1UL << 32) - 1)
 
+/** Use a large prime for cycling through all oids */
+#define OID_INC		   (10009729)
+
+static inline void
+oid_inc(daos_obj_id_t *oid)
+{
+	oid->hi = (oid->hi + OID_INC) & MAX_OID_HI;
+}
+
 typedef uint64_t dfs_magic_t;
 typedef uint16_t dfs_sb_ver_t;
 typedef uint16_t dfs_layout_ver_t;
@@ -337,20 +346,21 @@ oid_gen(dfs_t *dfs, daos_oclass_id_t oclass, bool file, daos_obj_id_t *oid)
 
 	D_MUTEX_LOCK(&dfs->lock);
 	/** If we ran out of local OIDs, alloc one from the container */
-	if (dfs->oid.hi >= MAX_OID_HI) {
+	if (dfs->oid.hi == 0) {
 		/** Allocate an OID for the namespace */
 		rc = daos_cont_alloc_oids(dfs->coh, 1, &dfs->oid.lo, NULL);
 		if (rc) {
 			D_ERROR("daos_cont_alloc_oids() Failed (%d)\n", rc);
 			D_MUTEX_UNLOCK(&dfs->lock);
 			return daos_der2errno(rc);
 		}
-		dfs->oid.hi = 0;
+		/** Start with OID_INC so final value will be 0 */
+		dfs->oid.hi = OID_INC;
 	}
 
 	/** set oid and lo, bump the current hi value */
 	oid->lo = dfs->oid.lo;
-	oid->hi = dfs->oid.hi++;
+	oid_inc(&oid);
 	D_MUTEX_UNLOCK(&dfs->lock);
 
 	/** if a regular file, use UINT64 typed dkeys for the array object */