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  * Copyright (c) 2012 by Delphix. All rights reserved.
24  * Copyright (c) 2014 Integros [integros.com]
25  */
26 
27 /* Portions Copyright 2010 Robert Milkowski */
28 
29 #ifndef	_SYS_ZIL_IMPL_H
30 #define	_SYS_ZIL_IMPL_H
31 
32 #include <sys/zil.h>
33 #include <sys/dmu_objset.h>
34 
35 #ifdef	__cplusplus
36 extern "C" {
37 #endif
38 
39 /*
40  * Log write buffer.
41  */
42 typedef struct lwb {
43 	zilog_t		*lwb_zilog;	/* back pointer to log struct */
44 	blkptr_t	lwb_blk;	/* on disk address of this log blk */
45 	boolean_t	lwb_slog;	/* lwb_blk is on SLOG device */
46 	int		lwb_nused;	/* # used bytes in buffer */
47 	int		lwb_sz;		/* size of block and buffer */
48 	char		*lwb_buf;	/* log write buffer */
49 	zio_t		*lwb_zio;	/* zio for this buffer */
50 	dmu_tx_t	*lwb_tx;	/* tx for log block allocation */
51 	uint64_t	lwb_max_txg;	/* highest txg in this lwb */
52 	list_node_t	lwb_node;	/* zilog->zl_lwb_list linkage */
53 } lwb_t;
54 
55 /*
56  * Intent log transaction lists
57  */
58 typedef struct itxs {
59 	list_t		i_sync_list;	/* list of synchronous itxs */
60 	avl_tree_t	i_async_tree;	/* tree of foids for async itxs */
61 } itxs_t;
62 
63 typedef struct itxg {
64 	kmutex_t	itxg_lock;	/* lock for this structure */
65 	uint64_t	itxg_txg;	/* txg for this chain */
66 	itxs_t		*itxg_itxs;	/* sync and async itxs */
67 } itxg_t;
68 
69 /* for async nodes we build up an AVL tree of lists of async itxs per file */
70 typedef struct itx_async_node {
71 	uint64_t	ia_foid;	/* file object id */
72 	list_t		ia_list;	/* list of async itxs for this foid */
73 	avl_node_t	ia_node;	/* AVL tree linkage */
74 } itx_async_node_t;
75 
76 /*
77  * Vdev flushing: during a zil_commit(), we build up an AVL tree of the vdevs
78  * we've touched so we know which ones need a write cache flush at the end.
79  */
80 typedef struct zil_vdev_node {
81 	uint64_t	zv_vdev;	/* vdev to be flushed */
82 	avl_node_t	zv_node;	/* AVL tree linkage */
83 } zil_vdev_node_t;
84 
85 #define	ZIL_PREV_BLKS 16
86 
87 /*
88  * Stable storage intent log management structure.  One per dataset.
89  */
90 struct zilog {
91 	kmutex_t	zl_lock;	/* protects most zilog_t fields */
92 	struct dsl_pool	*zl_dmu_pool;	/* DSL pool */
93 	spa_t		*zl_spa;	/* handle for read/write log */
94 	const zil_header_t *zl_header;	/* log header buffer */
95 	objset_t	*zl_os;		/* object set we're logging */
96 	zil_get_data_t	*zl_get_data;	/* callback to get object content */
97 	zio_t		*zl_root_zio;	/* log writer root zio */
98 	uint64_t	zl_lr_seq;	/* on-disk log record sequence number */
99 	uint64_t	zl_commit_lr_seq; /* last committed on-disk lr seq */
100 	uint64_t	zl_destroy_txg;	/* txg of last zil_destroy() */
101 	uint64_t	zl_replayed_seq[TXG_SIZE]; /* last replayed rec seq */
102 	uint64_t	zl_replaying_seq; /* current replay seq number */
103 	uint32_t	zl_suspend;	/* log suspend count */
104 	kcondvar_t	zl_cv_writer;	/* log writer thread completion */
105 	kcondvar_t	zl_cv_suspend;	/* log suspend completion */
106 	uint8_t		zl_suspending;	/* log is currently suspending */
107 	uint8_t		zl_keep_first;	/* keep first log block in destroy */
108 	uint8_t		zl_replay;	/* replaying records while set */
109 	uint8_t		zl_stop_sync;	/* for debugging */
110 	uint8_t		zl_writer;	/* boolean: write setup in progress */
111 	uint8_t		zl_logbias;	/* latency or throughput */
112 	uint8_t		zl_sync;	/* synchronous or asynchronous */
113 	int		zl_parse_error;	/* last zil_parse() error */
114 	uint64_t	zl_parse_blk_seq; /* highest blk seq on last parse */
115 	uint64_t	zl_parse_lr_seq; /* highest lr seq on last parse */
116 	uint64_t	zl_parse_blk_count; /* number of blocks parsed */
117 	uint64_t	zl_parse_lr_count; /* number of log records parsed */
118 	uint64_t	zl_next_batch;	/* next batch number */
119 	uint64_t	zl_com_batch;	/* committed batch number */
120 	kcondvar_t	zl_cv_batch[2];	/* batch condition variables */
121 	itxg_t		zl_itxg[TXG_SIZE]; /* intent log txg chains */
122 	list_t		zl_itx_commit_list; /* itx list to be committed */
123 	uint64_t	zl_cur_used;	/* current commit log size used */
124 	list_t		zl_lwb_list;	/* in-flight log write list */
125 	kmutex_t	zl_vdev_lock;	/* protects zl_vdev_tree */
126 	avl_tree_t	zl_vdev_tree;	/* vdevs to flush in zil_commit() */
127 	taskq_t		*zl_clean_taskq; /* runs lwb and itx clean tasks */
128 	avl_tree_t	zl_bp_tree;	/* track bps during log parse */
129 	clock_t		zl_replay_time;	/* lbolt of when replay started */
130 	uint64_t	zl_replay_blks;	/* number of log blocks replayed */
131 	zil_header_t	zl_old_header;	/* debugging aid */
132 	uint_t		zl_prev_blks[ZIL_PREV_BLKS]; /* size - sector rounded */
133 	uint_t		zl_prev_rotor;	/* rotor for zl_prev[] */
134 	txg_node_t	zl_dirty_link;	/* protected by dp_dirty_zilogs list */
135 };
136 
137 typedef struct zil_bp_node {
138 	dva_t		zn_dva;
139 	avl_node_t	zn_node;
140 } zil_bp_node_t;
141 
142 #define	ZIL_MAX_LOG_DATA (SPA_OLD_MAXBLOCKSIZE - sizeof (zil_chain_t) - \
143     sizeof (lr_write_t))
144 #define	ZIL_MAX_COPIED_DATA \
145     ((SPA_OLD_MAXBLOCKSIZE - sizeof (zil_chain_t)) / 2 - sizeof (lr_write_t))
146 
147 #ifdef	__cplusplus
148 }
149 #endif
150 
151 #endif	/* _SYS_ZIL_IMPL_H */
152