diff options
Diffstat (limited to 'include/sys/txg.h')
| -rw-r--r-- | include/sys/txg.h | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/include/sys/txg.h b/include/sys/txg.h new file mode 100644 index 000000000..e323d5efa --- /dev/null +++ b/include/sys/txg.h @@ -0,0 +1,131 @@ +/* + * 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 2010 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ + +#ifndef _SYS_TXG_H +#define _SYS_TXG_H + +#include <sys/spa.h> +#include <sys/zfs_context.h> + +#ifdef __cplusplus +extern "C" { +#endif + +#define TXG_CONCURRENT_STATES 3 /* open, quiescing, syncing */ +#define TXG_SIZE 4 /* next power of 2 */ +#define TXG_MASK (TXG_SIZE - 1) /* mask for size */ +#define TXG_INITIAL TXG_SIZE /* initial txg */ +#define TXG_IDX (txg & TXG_MASK) + +/* Number of txgs worth of frees we defer adding to in-core spacemaps */ +#define TXG_DEFER_SIZE 2 + +#define TXG_WAIT 1ULL +#define TXG_NOWAIT 2ULL + +typedef struct tx_cpu tx_cpu_t; + +typedef struct txg_handle { + tx_cpu_t *th_cpu; + uint64_t th_txg; +} txg_handle_t; + +typedef struct txg_node { + struct txg_node *tn_next[TXG_SIZE]; + uint8_t tn_member[TXG_SIZE]; +} txg_node_t; + +typedef struct txg_list { + kmutex_t tl_lock; + size_t tl_offset; + txg_node_t *tl_head[TXG_SIZE]; +} txg_list_t; + +struct dsl_pool; + +extern void txg_init(struct dsl_pool *dp, uint64_t txg); +extern void txg_fini(struct dsl_pool *dp); +extern void txg_sync_start(struct dsl_pool *dp); +extern void txg_sync_stop(struct dsl_pool *dp); +extern uint64_t txg_hold_open(struct dsl_pool *dp, txg_handle_t *txghp); +extern void txg_rele_to_quiesce(txg_handle_t *txghp); +extern void txg_rele_to_sync(txg_handle_t *txghp); +extern void txg_register_callbacks(txg_handle_t *txghp, list_t *tx_callbacks); + +/* + * Delay the caller by the specified number of ticks or until + * the txg closes (whichever comes first). This is intended + * to be used to throttle writers when the system nears its + * capacity. + */ +extern void txg_delay(struct dsl_pool *dp, uint64_t txg, int ticks); + +/* + * Wait until the given transaction group has finished syncing. + * Try to make this happen as soon as possible (eg. kick off any + * necessary syncs immediately). If txg==0, wait for the currently open + * txg to finish syncing. + */ +extern void txg_wait_synced(struct dsl_pool *dp, uint64_t txg); + +/* + * Wait until the given transaction group, or one after it, is + * the open transaction group. Try to make this happen as soon + * as possible (eg. kick off any necessary syncs immediately). + * If txg == 0, wait for the next open txg. + */ +extern void txg_wait_open(struct dsl_pool *dp, uint64_t txg); + +/* + * Returns TRUE if we are "backed up" waiting for the syncing + * transaction to complete; otherwise returns FALSE. + */ +extern boolean_t txg_stalled(struct dsl_pool *dp); + +/* returns TRUE if someone is waiting for the next txg to sync */ +extern boolean_t txg_sync_waiting(struct dsl_pool *dp); + +/* + * Per-txg object lists. + */ + +#define TXG_CLEAN(txg) ((txg) - 1) + +extern void txg_list_create(txg_list_t *tl, size_t offset); +extern void txg_list_destroy(txg_list_t *tl); +extern int txg_list_empty(txg_list_t *tl, uint64_t txg); +extern int txg_list_add(txg_list_t *tl, void *p, uint64_t txg); +extern int txg_list_add_tail(txg_list_t *tl, void *p, uint64_t txg); +extern void *txg_list_remove(txg_list_t *tl, uint64_t txg); +extern void *txg_list_remove_this(txg_list_t *tl, void *p, uint64_t txg); +extern int txg_list_member(txg_list_t *tl, void *p, uint64_t txg); +extern void *txg_list_head(txg_list_t *tl, uint64_t txg); +extern void *txg_list_next(txg_list_t *tl, void *p, uint64_t txg); + +#ifdef __cplusplus +} +#endif + +#endif /* _SYS_TXG_H */ |