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  * Copyright 2015 Nexenta Systems, Inc. All rights reserved.
  25  */
  26 
  27 #ifndef _SYS_DSL_SYNCTASK_H
  28 #define _SYS_DSL_SYNCTASK_H
  29 
  30 #include <sys/txg.h>
  31 #include <sys/zfs_context.h>
  32 
  33 #ifdef  __cplusplus
  34 extern "C" {
  35 #endif
  36 
  37 struct dsl_pool;
  38 
  39 typedef int (dsl_checkfunc_t)(void *, dmu_tx_t *);
  40 typedef void (dsl_syncfunc_t)(void *, dmu_tx_t *);
  41 
  42 typedef enum zfs_space_check {
  43         /*
  44          * Normal space check: if there is less than 3.2% free space,
  45          * the operation will fail.  Operations which are logically
  46          * creating things should use this (e.g. "zfs create", "zfs snapshot").
  47          * User writes (via the ZPL / ZVOL) also fail at this point.
  48          */
  49         ZFS_SPACE_CHECK_NORMAL,
  50 
  51         /*
  52          * Space check allows use of half the slop space.  If there
  53          * is less than 1.6% free space, the operation will fail.  Most
  54          * operations should use this (e.g. "zfs set", "zfs rename"),
  55          * because we want them to succeed even after user writes are failing,
  56          * so that they can be used as part of the space recovery process.
  57          */
  58         ZFS_SPACE_CHECK_RESERVED,
  59 
  60         /*
  61          * No space check is performed.  Only operations which we expect to
  62          * result in a net reduction in space should use this
  63          * (e.g. "zfs destroy". Setting quotas & reservations also uses
  64          * this because it needs to circumvent the quota/reservation checks).
  65          *
  66          * See also the comments above spa_slop_shift.
  67          */
  68         ZFS_SPACE_CHECK_NONE,
  69 } zfs_space_check_t;
  70 
  71 typedef struct dsl_sync_task {
  72         txg_node_t dst_node;
  73         struct dsl_pool *dst_pool;
  74         uint64_t dst_txg;
  75         int dst_space;
  76         zfs_space_check_t dst_space_check;
  77         dsl_checkfunc_t *dst_checkfunc;
  78         dsl_syncfunc_t *dst_syncfunc;
  79         void *dst_arg;
  80         int dst_error;
  81         boolean_t dst_nowaiter;
  82 } dsl_sync_task_t;
  83 
  84 void dsl_sync_task_sync(dsl_sync_task_t *, dmu_tx_t *);
  85 int dsl_sync_task(const char *, dsl_checkfunc_t *,
  86     dsl_syncfunc_t *, void *, int, zfs_space_check_t);
  87 void dsl_sync_task_nowait(struct dsl_pool *, dsl_syncfunc_t *,
  88     void *, int, zfs_space_check_t, dmu_tx_t *);
  89 #define DST_AVG_BLKSHIFT 14
  90 
  91 #ifdef  __cplusplus
  92 }
  93 #endif
  94 
  95 #endif /* _SYS_DSL_SYNCTASK_H */