dsl_synctask.h revision 269006 
1/*
2 * CDDL HEADER START
3 *
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.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
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]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2012, 2014 by Delphix. All rights reserved.
24 */
25
26#ifndef	_SYS_DSL_SYNCTASK_H
27#define	_SYS_DSL_SYNCTASK_H
28
29#include <sys/txg.h>
30#include <sys/zfs_context.h>
31
32#ifdef	__cplusplus
33extern "C" {
34#endif
35
36struct dsl_pool;
37
38typedef int (dsl_checkfunc_t)(void *, dmu_tx_t *);
39typedef void (dsl_syncfunc_t)(void *, dmu_tx_t *);
40
41typedef enum zfs_space_check {
42	/*
43	 * Normal space check: if there is less than 3.2% free space,
44	 * the operation will fail.  Operations which are logically
45	 * creating things should use this (e.g. "zfs create", "zfs snapshot").
46	 * User writes (via the ZPL / ZVOL) also fail at this point.
47	 */
48	ZFS_SPACE_CHECK_NORMAL,
49
50	/*
51	 * Space check allows use of half the slop space.  If there
52	 * is less than 1.6% free space, the operation will fail.  Most
53	 * operations should use this (e.g. "zfs set", "zfs rename"),
54	 * because we want them to succeed even after user writes are failing,
55	 * so that they can be used as part of the space recovery process.
56	 */
57	ZFS_SPACE_CHECK_RESERVED,
58
59	/*
60	 * No space check is performed.  Only operations which we expect to
61	 * result in a net reduction in space should use this
62	 * (e.g. "zfs destroy". Setting quotas & reservations also uses
63	 * this because it needs to circumvent the quota/reservation checks).
64	 *
65	 * See also the comments above spa_slop_shift.
66	 */
67	ZFS_SPACE_CHECK_NONE,
68} zfs_space_check_t;
69
70typedef struct dsl_sync_task {
71	txg_node_t dst_node;
72	struct dsl_pool *dst_pool;
73	uint64_t dst_txg;
74	int dst_space;
75	zfs_space_check_t dst_space_check;
76	dsl_checkfunc_t *dst_checkfunc;
77	dsl_syncfunc_t *dst_syncfunc;
78	void *dst_arg;
79	int dst_error;
80	boolean_t dst_nowaiter;
81} dsl_sync_task_t;
82
83void dsl_sync_task_sync(dsl_sync_task_t *, dmu_tx_t *);
84int dsl_sync_task(const char *, dsl_checkfunc_t *,
85    dsl_syncfunc_t *, void *, int, zfs_space_check_t);
86void dsl_sync_task_nowait(struct dsl_pool *, dsl_syncfunc_t *,
87    void *, int, zfs_space_check_t, dmu_tx_t *);
88
89#ifdef	__cplusplus
90}
91#endif
92
93#endif /* _SYS_DSL_SYNCTASK_H */
94