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-rw-r--r--uts/common/fs/zfs/sys/txg.h131
1 files changed, 131 insertions, 0 deletions
diff --git a/uts/common/fs/zfs/sys/txg.h b/uts/common/fs/zfs/sys/txg.h
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+++ b/uts/common/fs/zfs/sys/txg.h
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+/*
+ * 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 */