zil_impl.h revision 219089 
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 */
24
25/* Portions Copyright 2010 Robert Milkowski */
26
27#ifndef	_SYS_ZIL_IMPL_H
28#define	_SYS_ZIL_IMPL_H
29
30#include <sys/zil.h>
31#include <sys/dmu_objset.h>
32
33#ifdef	__cplusplus
34extern "C" {
35#endif
36
37/*
38 * Log write buffer.
39 */
40typedef struct lwb {
41	zilog_t		*lwb_zilog;	/* back pointer to log struct */
42	blkptr_t	lwb_blk;	/* on disk address of this log blk */
43	int		lwb_nused;	/* # used bytes in buffer */
44	int		lwb_sz;		/* size of block and buffer */
45	char		*lwb_buf;	/* log write buffer */
46	zio_t		*lwb_zio;	/* zio for this buffer */
47	dmu_tx_t	*lwb_tx;	/* tx for log block allocation */
48	uint64_t	lwb_max_txg;	/* highest txg in this lwb */
49	list_node_t	lwb_node;	/* zilog->zl_lwb_list linkage */
50} lwb_t;
51
52/*
53 * Intent log transaction lists
54 */
55typedef struct itxs {
56	list_t		i_sync_list;	/* list of synchronous itxs */
57	avl_tree_t	i_async_tree;	/* tree of foids for async itxs */
58} itxs_t;
59
60typedef struct itxg {
61	kmutex_t	itxg_lock;	/* lock for this structure */
62	uint64_t	itxg_txg;	/* txg for this chain */
63	uint64_t	itxg_sod;	/* total size on disk for this txg */
64	itxs_t		*itxg_itxs;	/* sync and async itxs */
65} itxg_t;
66
67/* for async nodes we build up an AVL tree of lists of async itxs per file */
68typedef struct itx_async_node {
69	uint64_t	ia_foid;	/* file object id */
70	list_t		ia_list;	/* list of async itxs for this foid */
71	avl_node_t	ia_node;	/* AVL tree linkage */
72} itx_async_node_t;
73
74/*
75 * Vdev flushing: during a zil_commit(), we build up an AVL tree of the vdevs
76 * we've touched so we know which ones need a write cache flush at the end.
77 */
78typedef struct zil_vdev_node {
79	uint64_t	zv_vdev;	/* vdev to be flushed */
80	avl_node_t	zv_node;	/* AVL tree linkage */
81} zil_vdev_node_t;
82
83#define	ZIL_PREV_BLKS 16
84
85/*
86 * Stable storage intent log management structure.  One per dataset.
87 */
88struct zilog {
89	kmutex_t	zl_lock;	/* protects most zilog_t fields */
90	struct dsl_pool	*zl_dmu_pool;	/* DSL pool */
91	spa_t		*zl_spa;	/* handle for read/write log */
92	const zil_header_t *zl_header;	/* log header buffer */
93	objset_t	*zl_os;		/* object set we're logging */
94	zil_get_data_t	*zl_get_data;	/* callback to get object content */
95	zio_t		*zl_root_zio;	/* log writer root zio */
96	uint64_t	zl_lr_seq;	/* on-disk log record sequence number */
97	uint64_t	zl_commit_lr_seq; /* last committed on-disk lr seq */
98	uint64_t	zl_destroy_txg;	/* txg of last zil_destroy() */
99	uint64_t	zl_replayed_seq[TXG_SIZE]; /* last replayed rec seq */
100	uint64_t	zl_replaying_seq; /* current replay seq number */
101	uint32_t	zl_suspend;	/* log suspend count */
102	kcondvar_t	zl_cv_writer;	/* log writer thread completion */
103	kcondvar_t	zl_cv_suspend;	/* log suspend completion */
104	uint8_t		zl_suspending;	/* log is currently suspending */
105	uint8_t		zl_keep_first;	/* keep first log block in destroy */
106	uint8_t		zl_replay;	/* replaying records while set */
107	uint8_t		zl_stop_sync;	/* for debugging */
108	uint8_t		zl_writer;	/* boolean: write setup in progress */
109	uint8_t		zl_logbias;	/* latency or throughput */
110	uint8_t		zl_sync;	/* synchronous or asynchronous */
111	int		zl_parse_error;	/* last zil_parse() error */
112	uint64_t	zl_parse_blk_seq; /* highest blk seq on last parse */
113	uint64_t	zl_parse_lr_seq; /* highest lr seq on last parse */
114	uint64_t	zl_parse_blk_count; /* number of blocks parsed */
115	uint64_t	zl_parse_lr_count; /* number of log records parsed */
116	uint64_t	zl_next_batch;	/* next batch number */
117	uint64_t	zl_com_batch;	/* committed batch number */
118	kcondvar_t	zl_cv_batch[2];	/* batch condition variables */
119	itxg_t		zl_itxg[TXG_SIZE]; /* intent log txg chains */
120	list_t		zl_itx_commit_list; /* itx list to be committed */
121	uint64_t	zl_itx_list_sz;	/* total size of records on list */
122	uint64_t	zl_cur_used;	/* current commit log size used */
123	list_t		zl_lwb_list;	/* in-flight log write list */
124	kmutex_t	zl_vdev_lock;	/* protects zl_vdev_tree */
125	avl_tree_t	zl_vdev_tree;	/* vdevs to flush in zil_commit() */
126	taskq_t		*zl_clean_taskq; /* runs lwb and itx clean tasks */
127	avl_tree_t	zl_bp_tree;	/* track bps during log parse */
128	clock_t		zl_replay_time;	/* lbolt of when replay started */
129	uint64_t	zl_replay_blks;	/* number of log blocks replayed */
130	zil_header_t	zl_old_header;	/* debugging aid */
131	uint_t		zl_prev_blks[ZIL_PREV_BLKS]; /* size - sector rounded */
132	uint_t		zl_prev_rotor;	/* rotor for zl_prev[] */
133};
134
135typedef struct zil_bp_node {
136	dva_t		zn_dva;
137	avl_node_t	zn_node;
138} zil_bp_node_t;
139
140#define	ZIL_MAX_LOG_DATA (SPA_MAXBLOCKSIZE - sizeof (zil_chain_t) - \
141    sizeof (lr_write_t))
142
143#ifdef	__cplusplus
144}
145#endif
146
147#endif	/* _SYS_ZIL_IMPL_H */
148