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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2012, 2017 by Delphix. All rights reserved.
*/
#ifndef _SYS_DSL_SYNCTASK_H
#define _SYS_DSL_SYNCTASK_H
#include <sys/txg.h>
#include <sys/zfs_context.h>
#ifdef __cplusplus
extern "C" {
#endif
struct dsl_pool;
typedef int (dsl_checkfunc_t)(void *, dmu_tx_t *);
typedef void (dsl_syncfunc_t)(void *, dmu_tx_t *);
typedef void (dsl_sigfunc_t)(void *, dmu_tx_t *);
typedef enum zfs_space_check {
/*
* Normal space check: if there is less than 3.2% free space (bounded
* by spa_max_slop), the operation will fail. Operations which are
* logically creating things should use this (e.g. "zfs create", "zfs
* snapshot"). User writes (via the ZPL / ZVOL) also fail at this
* point.
*/
ZFS_SPACE_CHECK_NORMAL,
/*
* Space check allows use of half the slop space. If there
* is less than 1.6% free space, the operation will fail. Most
* operations should use this (e.g. "zfs set", "zfs rename"),
* because we want them to succeed even after user writes are failing,
* so that they can be used as part of the space recovery process.
*/
ZFS_SPACE_CHECK_RESERVED,
/*
* Space check allows use of three quarters of the slop space.
* If there is less than 0.8% free space, the operation will
* fail.
*/
ZFS_SPACE_CHECK_EXTRA_RESERVED,
/*
* In all cases "zfs destroy" is expected to result in an net
* reduction of space, except one. When the pool has a
* checkpoint, space freed by "zfs destroy" will not actually
* free anything internally. Thus, it starts failing after
* three quarters of the slop space is exceeded.
*/
ZFS_SPACE_CHECK_DESTROY = ZFS_SPACE_CHECK_EXTRA_RESERVED,
/*
* A channel program can run a "zfs destroy" as part of its
* script and therefore has the same space_check policy when
* being evaluated.
*/
ZFS_SPACE_CHECK_ZCP_EVAL = ZFS_SPACE_CHECK_DESTROY,
/*
* No space check is performed. This level of space check should
* be used cautiously as operations that use it can even run when
* 0.8% capacity is left for use. In this scenario, if there is a
* checkpoint, async destroys are suspended and any kind of freeing
* can potentially add space instead of freeing it.
*
* See also the comments above spa_slop_shift.
*/
ZFS_SPACE_CHECK_NONE,
ZFS_SPACE_CHECK_DISCARD_CHECKPOINT = ZFS_SPACE_CHECK_NONE,
} zfs_space_check_t;
typedef struct dsl_sync_task {
txg_node_t dst_node;
struct dsl_pool *dst_pool;
uint64_t dst_txg;
int dst_space;
zfs_space_check_t dst_space_check;
dsl_checkfunc_t *dst_checkfunc;
dsl_syncfunc_t *dst_syncfunc;
void *dst_arg;
int dst_error;
boolean_t dst_nowaiter;
} dsl_sync_task_t;
void dsl_sync_task_sync(dsl_sync_task_t *, dmu_tx_t *);
int dsl_sync_task(const char *, dsl_checkfunc_t *,
dsl_syncfunc_t *, void *, int, zfs_space_check_t);
void dsl_sync_task_nowait(struct dsl_pool *, dsl_syncfunc_t *,
void *, dmu_tx_t *);
int dsl_early_sync_task(const char *, dsl_checkfunc_t *,
dsl_syncfunc_t *, void *, int, zfs_space_check_t);
void dsl_early_sync_task_nowait(struct dsl_pool *, dsl_syncfunc_t *,
void *, dmu_tx_t *);
int dsl_sync_task_sig(const char *, dsl_checkfunc_t *, dsl_syncfunc_t *,
dsl_sigfunc_t *, void *, int, zfs_space_check_t);
#ifdef __cplusplus
}
#endif
#endif /* _SYS_DSL_SYNCTASK_H */
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