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67a1b03791
Block Cloning allows to manually clone a file (or a subset of its blocks) into another (or the same) file by just creating additional references to the data blocks without copying the data itself. Those references are kept in the Block Reference Tables (BRTs). The whole design of block cloning is documented in module/zfs/brt.c. Reviewed-by: Alexander Motin <mav@FreeBSD.org> Reviewed-by: Christian Schwarz <christian.schwarz@nutanix.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Rich Ercolani <rincebrain@gmail.com> Signed-off-by: Pawel Jakub Dawidek <pawel@dawidek.net> Closes #13392
180 lines
4.5 KiB
C
180 lines
4.5 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or https://opensource.org/licenses/CDDL-1.0.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2010 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/*
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* Copyright (c) 2012, 2016 by Delphix. All rights reserved.
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*/
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#ifndef _SYS_DMU_TX_H
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#define _SYS_DMU_TX_H
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#include <sys/inttypes.h>
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#include <sys/dmu.h>
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#include <sys/txg.h>
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#include <sys/zfs_refcount.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct dmu_buf_impl;
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struct dmu_tx_hold;
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struct dnode_link;
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struct dsl_pool;
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struct dnode;
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struct dsl_dir;
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struct dmu_tx {
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/*
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* No synchronization is needed because a tx can only be handled
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* by one thread.
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*/
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list_t tx_holds; /* list of dmu_tx_hold_t */
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objset_t *tx_objset;
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struct dsl_dir *tx_dir;
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struct dsl_pool *tx_pool;
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uint64_t tx_txg;
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uint64_t tx_lastsnap_txg;
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uint64_t tx_lasttried_txg;
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txg_handle_t tx_txgh;
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void *tx_tempreserve_cookie;
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struct dmu_tx_hold *tx_needassign_txh;
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/* list of dmu_tx_callback_t on this dmu_tx */
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list_t tx_callbacks;
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/* placeholder for syncing context, doesn't need specific holds */
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boolean_t tx_anyobj;
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/* transaction is marked as being a "net free" of space */
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boolean_t tx_netfree;
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/* time this transaction was created */
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hrtime_t tx_start;
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/* need to wait for sufficient dirty space */
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boolean_t tx_wait_dirty;
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/* has this transaction already been delayed? */
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boolean_t tx_dirty_delayed;
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int tx_err;
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};
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enum dmu_tx_hold_type {
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THT_NEWOBJECT,
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THT_WRITE,
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THT_BONUS,
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THT_FREE,
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THT_ZAP,
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THT_SPACE,
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THT_SPILL,
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THT_CLONE,
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THT_NUMTYPES
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};
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typedef struct dmu_tx_hold {
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dmu_tx_t *txh_tx;
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list_node_t txh_node;
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struct dnode *txh_dnode;
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zfs_refcount_t txh_space_towrite;
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zfs_refcount_t txh_memory_tohold;
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enum dmu_tx_hold_type txh_type;
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uint64_t txh_arg1;
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uint64_t txh_arg2;
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} dmu_tx_hold_t;
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typedef struct dmu_tx_callback {
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list_node_t dcb_node; /* linked to tx_callbacks list */
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dmu_tx_callback_func_t *dcb_func; /* caller function pointer */
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void *dcb_data; /* caller private data */
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} dmu_tx_callback_t;
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/*
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* Used for dmu tx kstat.
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*/
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typedef struct dmu_tx_stats {
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kstat_named_t dmu_tx_assigned;
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kstat_named_t dmu_tx_delay;
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kstat_named_t dmu_tx_error;
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kstat_named_t dmu_tx_suspended;
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kstat_named_t dmu_tx_group;
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kstat_named_t dmu_tx_memory_reserve;
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kstat_named_t dmu_tx_memory_reclaim;
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kstat_named_t dmu_tx_dirty_throttle;
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kstat_named_t dmu_tx_dirty_delay;
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kstat_named_t dmu_tx_dirty_over_max;
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kstat_named_t dmu_tx_dirty_frees_delay;
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kstat_named_t dmu_tx_wrlog_delay;
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kstat_named_t dmu_tx_quota;
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} dmu_tx_stats_t;
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extern dmu_tx_stats_t dmu_tx_stats;
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#define DMU_TX_STAT_INCR(stat, val) \
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atomic_add_64(&dmu_tx_stats.stat.value.ui64, (val));
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#define DMU_TX_STAT_BUMP(stat) \
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DMU_TX_STAT_INCR(stat, 1);
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/*
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* These routines are defined in dmu.h, and are called by the user.
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*/
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dmu_tx_t *dmu_tx_create(objset_t *dd);
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int dmu_tx_assign(dmu_tx_t *tx, uint64_t txg_how);
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void dmu_tx_commit(dmu_tx_t *tx);
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void dmu_tx_abort(dmu_tx_t *tx);
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uint64_t dmu_tx_get_txg(dmu_tx_t *tx);
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struct dsl_pool *dmu_tx_pool(dmu_tx_t *tx);
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void dmu_tx_wait(dmu_tx_t *tx);
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/*
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* These routines are defined in dmu_spa.h, and are called by the SPA.
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*/
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extern dmu_tx_t *dmu_tx_create_assigned(struct dsl_pool *dp, uint64_t txg);
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/*
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* These routines are only called by the DMU.
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*/
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dmu_tx_t *dmu_tx_create_dd(dsl_dir_t *dd);
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int dmu_tx_is_syncing(dmu_tx_t *tx);
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int dmu_tx_private_ok(dmu_tx_t *tx);
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void dmu_tx_add_new_object(dmu_tx_t *tx, dnode_t *dn);
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void dmu_tx_dirty_buf(dmu_tx_t *tx, struct dmu_buf_impl *db);
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void dmu_tx_hold_space(dmu_tx_t *tx, uint64_t space);
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#ifdef ZFS_DEBUG
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#define DMU_TX_DIRTY_BUF(tx, db) dmu_tx_dirty_buf(tx, db)
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#else
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#define DMU_TX_DIRTY_BUF(tx, db)
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#endif
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void dmu_tx_init(void);
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void dmu_tx_fini(void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_DMU_TX_H */
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