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      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
     33 extern "C" {
     34 #endif
     35 
     36 struct dsl_pool;
     37 
     38 typedef int (dsl_checkfunc_t)(void *, dmu_tx_t *);
     39 typedef void (dsl_syncfunc_t)(void *, dmu_tx_t *);
     40 
     41 typedef 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 
     70 typedef 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 
     83 void dsl_sync_task_sync(dsl_sync_task_t *, dmu_tx_t *);
     84 int dsl_sync_task(const char *, dsl_checkfunc_t *,
     85     dsl_syncfunc_t *, void *, int, zfs_space_check_t);
     86 void 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