4045 zfs write throttle & i/o scheduler performance work
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com>

@@ -18,11 +18,11 @@
  *
  * CDDL HEADER END
  */
 /*
  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2012 by Delphix. All rights reserved.
+ * Copyright (c) 2013 by Delphix. All rights reserved.
  * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
  */
 
 #ifndef _SYS_DBUF_H
 #define _SYS_DBUF_H

@@ -110,10 +110,13 @@
         struct dbuf_dirty_record *dr_next;
 
         /* pointer to parent dirty record */
         struct dbuf_dirty_record *dr_parent;
 
+        /* How much space was changed to dsl_pool_dirty_space() for this? */
+        unsigned int dr_accounted;
+
         union dirty_types {
                 struct dirty_indirect {
 
                         /* protect access to list */
                         kmutex_t dr_mtx;

@@ -252,11 +255,11 @@
 dmu_buf_impl_t *dbuf_hold_level(struct dnode *dn, int level, uint64_t blkid,
     void *tag);
 int dbuf_hold_impl(struct dnode *dn, uint8_t level, uint64_t blkid, int create,
     void *tag, dmu_buf_impl_t **dbp);
 
-void dbuf_prefetch(struct dnode *dn, uint64_t blkid);
+void dbuf_prefetch(struct dnode *dn, uint64_t blkid, zio_priority_t prio);
 
 void dbuf_add_ref(dmu_buf_impl_t *db, void *tag);
 uint64_t dbuf_refcount(dmu_buf_impl_t *db);
 
 void dbuf_rele(dmu_buf_impl_t *db, void *tag);