Imported Upstream version 0.6.5.3

[mirror_zfs-debian.git] / include / sys / dbuf.h

diff --git a/include/sys/dbuf.h b/include/sys/dbuf.h
index 1eabfd7daccfbd37df7524691a7e21f885e05204..0d262e87b5bc9fca09073783719b75eab25a83c5 100644 (file)
--- a/include/sys/dbuf.h
+++ b/include/sys/dbuf.h
@@ -20,8 +20,9 @@
  */
 /*
  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2013 by Delphix. All rights reserved.
+ * Copyright (c) 2012, 2015 by Delphix. All rights reserved.
  * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
+ * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
  */
 
 #ifndef        _SYS_DBUF_H
@@ -66,8 +67,13 @@ extern "C" {
  *             |                        |
  *             |                        |
  *             +--------> NOFILL -------+
+ *
+ * DB_SEARCH is an invalid state for a dbuf. It is used by dbuf_free_range
+ * to find all dbufs in a range of a dnode and must be less than any other
+ * dbuf_states_t (see comment on dn_dbufs in dnode.h).
  */
 typedef enum dbuf_states {
+       DB_SEARCH = -1,
        DB_UNCACHED,
        DB_FILL,
        DB_NOFILL,
@@ -217,18 +223,32 @@ typedef struct dmu_buf_impl {
         * Our link on the owner dnodes's dn_dbufs list.
         * Protected by its dn_dbufs_mtx.
         */
-       list_node_t db_link;
+       avl_node_t db_link;
 
        /* Data which is unique to data (leaf) blocks: */
 
-       /* stuff we store for the user (see dmu_buf_set_user) */
-       void *db_user_ptr;
-       void **db_user_data_ptr_ptr;
-       dmu_buf_evict_func_t *db_evict_func;
+       /* User callback information. */
+       dmu_buf_user_t *db_user;
 
-       uint8_t db_immediate_evict;
+       /*
+        * Evict user data as soon as the dirty and reference
+        * counts are equal.
+        */
+       uint8_t db_user_immediate_evict;
+
+       /*
+        * This block was freed while a read or write was
+        * active.
+        */
        uint8_t db_freed_in_flight;
 
+       /*
+        * dnode_evict_dbufs() or dnode_evict_bonus() tried to
+        * evict this dbuf, but couldn't due to outstanding
+        * references.  Evict once the refcount drops to 0.
+        */
+       uint8_t db_pending_evict;
+
        uint8_t db_dirtycnt;
 } dmu_buf_impl_t;
 
@@ -258,12 +278,15 @@ int dbuf_hold_impl(struct dnode *dn, uint8_t level, uint64_t blkid, int create,
 void dbuf_prefetch(struct dnode *dn, uint64_t blkid, zio_priority_t prio);
 
 void dbuf_add_ref(dmu_buf_impl_t *db, void *tag);
+boolean_t dbuf_try_add_ref(dmu_buf_t *db, objset_t *os, uint64_t obj,
+    uint64_t blkid, void *tag);
 uint64_t dbuf_refcount(dmu_buf_impl_t *db);
 
 void dbuf_rele(dmu_buf_impl_t *db, void *tag);
 void dbuf_rele_and_unlock(dmu_buf_impl_t *db, void *tag);
 
-dmu_buf_impl_t *dbuf_find(struct dnode *dn, uint8_t level, uint64_t blkid);
+dmu_buf_impl_t *dbuf_find(struct objset *os, uint64_t object, uint8_t level,
+    uint64_t blkid);
 
 int dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags);
 void dmu_buf_will_not_fill(dmu_buf_t *db, dmu_tx_t *tx);
@@ -280,7 +303,7 @@ void dbuf_clear(dmu_buf_impl_t *db);
 void dbuf_evict(dmu_buf_impl_t *db);
 
 void dbuf_unoverride(dbuf_dirty_record_t *dr);
-void dbuf_sync_list(list_t *list, dmu_tx_t *tx);
+void dbuf_sync_list(list_t *list, int level, dmu_tx_t *tx);
 void dbuf_release_bp(dmu_buf_impl_t *db);
 
 void dbuf_free_range(struct dnode *dn, uint64_t start, uint64_t end,