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1c5de20ae2
Allow rigorous (and expensive) tx validation to be enabled/disabled
indepentantly from the standard zfs debugging. When enabled these
checks ensure that all txs are constructed properly and that a dbuf
is never dirtied without taking the correct tx hold.
This checking is particularly helpful when adding new dmu consumers
like Lustre. However, for established consumers such as the zpl
with no known outstanding tx construction problems this is just
overhead.
--enable-debug-dmu-tx - Enable/disable validation of each tx as
--disable-debug-dmu-tx it is constructed. By default validation
is disabled due to performance concerns.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
177 lines
4.5 KiB
C
177 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 http://www.opensolaris.org/os/licensing.
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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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#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/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_t tx_callbacks; /* list of dmu_tx_callback_t on this dmu_tx */
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uint8_t tx_anyobj;
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int tx_err;
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#ifdef DEBUG_DMU_TX
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uint64_t tx_space_towrite;
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uint64_t tx_space_tofree;
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uint64_t tx_space_tooverwrite;
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uint64_t tx_space_tounref;
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refcount_t tx_space_written;
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refcount_t tx_space_freed;
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#endif
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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_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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uint64_t txh_space_towrite;
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uint64_t txh_space_tofree;
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uint64_t txh_space_tooverwrite;
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uint64_t txh_space_tounref;
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uint64_t txh_memory_tohold;
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uint64_t txh_fudge;
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#ifdef DEBUG_DMU_TX
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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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#endif
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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_how;
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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_memory_inflight;
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kstat_named_t dmu_tx_dirty_throttle;
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kstat_named_t dmu_tx_write_limit;
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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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void dmu_tx_wait(dmu_tx_t *tx);
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void dmu_tx_callback_register(dmu_tx_t *tx, dmu_tx_callback_func_t *dcb_func,
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void *dcb_data);
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void dmu_tx_do_callbacks(list_t *cb_list, int error);
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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, objset_t *os, uint64_t object);
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void dmu_tx_willuse_space(dmu_tx_t *tx, int64_t delta);
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void dmu_tx_dirty_buf(dmu_tx_t *tx, struct dmu_buf_impl *db);
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int dmu_tx_holds(dmu_tx_t *tx, uint64_t object);
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void dmu_tx_hold_space(dmu_tx_t *tx, uint64_t space);
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#ifdef DEBUG_DMU_TX
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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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