4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or https://opensource.org/licenses/CDDL-1.0.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
27 * Copyright (c) 2014, 2017 by Delphix. All rights reserved.
33 #include <sys/zfs_context.h>
39 extern uint64_t zfetch_array_rd_sz;
41 struct dnode; /* so we can reference dnode */
43 typedef struct zfetch {
44 kmutex_t zf_lock; /* protects zfetch structure */
45 list_t zf_stream; /* list of zstream_t's */
46 struct dnode *zf_dnode; /* dnode that owns this zfetch */
47 int zf_numstreams; /* number of zstream_t's */
50 typedef struct zstream {
51 uint64_t zs_blkid; /* expect next access at this blkid */
52 unsigned int zs_pf_dist; /* data prefetch distance in bytes */
53 unsigned int zs_ipf_dist; /* L1 prefetch distance in bytes */
54 uint64_t zs_pf_start; /* first data block to prefetch */
55 uint64_t zs_pf_end; /* data block to prefetch up to */
56 uint64_t zs_ipf_start; /* first data block to prefetch L1 */
57 uint64_t zs_ipf_end; /* data block to prefetch L1 up to */
59 list_node_t zs_node; /* link for zf_stream */
60 hrtime_t zs_atime; /* time last prefetch issued */
61 zfetch_t *zs_fetch; /* parent fetch */
62 boolean_t zs_missed; /* stream saw cache misses */
63 boolean_t zs_more; /* need more distant prefetch */
64 zfs_refcount_t zs_callers; /* number of pending callers */
66 * Number of stream references: dnode, callers and pending blocks.
67 * The stream memory is freed when the number returns to zero.
69 zfs_refcount_t zs_refs;
72 void zfetch_init(void);
73 void zfetch_fini(void);
75 void dmu_zfetch_init(zfetch_t *, struct dnode *);
76 void dmu_zfetch_fini(zfetch_t *);
77 zstream_t *dmu_zfetch_prepare(zfetch_t *, uint64_t, uint64_t, boolean_t,
79 void dmu_zfetch_run(zstream_t *, boolean_t, boolean_t);
80 void dmu_zfetch(zfetch_t *, uint64_t, uint64_t, boolean_t, boolean_t,
88 #endif /* _DMU_ZFETCH_H */