xref: /titanic_41/usr/src/uts/common/fs/zfs/sys/zil_impl.h (revision d1a98260e8f32ca878695081cdb8ed91426a63e2)
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  */
25 
26 /* Portions Copyright 2010 Robert Milkowski */
27 
28 #ifndef	_SYS_ZIL_IMPL_H
29 #define	_SYS_ZIL_IMPL_H
30 
31 #include <sys/zil.h>
32 #include <sys/dmu_objset.h>
33 
34 #ifdef	__cplusplus
35 extern "C" {
36 #endif
37 
38 /*
39  * Log write buffer.
40  */
41 typedef struct lwb {
42 	zilog_t		*lwb_zilog;	/* back pointer to log struct */
43 	blkptr_t	lwb_blk;	/* on disk address of this log blk */
44 	int		lwb_nused;	/* # used bytes in buffer */
45 	int		lwb_sz;		/* size of block and buffer */
46 	char		*lwb_buf;	/* log write buffer */
47 	zio_t		*lwb_zio;	/* zio for this buffer */
48 	dmu_tx_t	*lwb_tx;	/* tx for log block allocation */
49 	uint64_t	lwb_max_txg;	/* highest txg in this lwb */
50 	list_node_t	lwb_node;	/* zilog->zl_lwb_list linkage */
51 } lwb_t;
52 
53 /*
54  * Intent log transaction lists
55  */
56 typedef struct itxs {
57 	list_t		i_sync_list;	/* list of synchronous itxs */
58 	avl_tree_t	i_async_tree;	/* tree of foids for async itxs */
59 } itxs_t;
60 
61 typedef struct itxg {
62 	kmutex_t	itxg_lock;	/* lock for this structure */
63 	uint64_t	itxg_txg;	/* txg for this chain */
64 	uint64_t	itxg_sod;	/* total size on disk for this txg */
65 	itxs_t		*itxg_itxs;	/* sync and async itxs */
66 } itxg_t;
67 
68 /* for async nodes we build up an AVL tree of lists of async itxs per file */
69 typedef struct itx_async_node {
70 	uint64_t	ia_foid;	/* file object id */
71 	list_t		ia_list;	/* list of async itxs for this foid */
72 	avl_node_t	ia_node;	/* AVL tree linkage */
73 } itx_async_node_t;
74 
75 /*
76  * Vdev flushing: during a zil_commit(), we build up an AVL tree of the vdevs
77  * we've touched so we know which ones need a write cache flush at the end.
78  */
79 typedef struct zil_vdev_node {
80 	uint64_t	zv_vdev;	/* vdev to be flushed */
81 	avl_node_t	zv_node;	/* AVL tree linkage */
82 } zil_vdev_node_t;
83 
84 #define	ZIL_PREV_BLKS 16
85 
86 /*
87  * Stable storage intent log management structure.  One per dataset.
88  */
89 struct zilog {
90 	kmutex_t	zl_lock;	/* protects most zilog_t fields */
91 	struct dsl_pool	*zl_dmu_pool;	/* DSL pool */
92 	spa_t		*zl_spa;	/* handle for read/write log */
93 	const zil_header_t *zl_header;	/* log header buffer */
94 	objset_t	*zl_os;		/* object set we're logging */
95 	zil_get_data_t	*zl_get_data;	/* callback to get object content */
96 	zio_t		*zl_root_zio;	/* log writer root zio */
97 	uint64_t	zl_lr_seq;	/* on-disk log record sequence number */
98 	uint64_t	zl_commit_lr_seq; /* last committed on-disk lr seq */
99 	uint64_t	zl_destroy_txg;	/* txg of last zil_destroy() */
100 	uint64_t	zl_replayed_seq[TXG_SIZE]; /* last replayed rec seq */
101 	uint64_t	zl_replaying_seq; /* current replay seq number */
102 	uint32_t	zl_suspend;	/* log suspend count */
103 	kcondvar_t	zl_cv_writer;	/* log writer thread completion */
104 	kcondvar_t	zl_cv_suspend;	/* log suspend completion */
105 	uint8_t		zl_suspending;	/* log is currently suspending */
106 	uint8_t		zl_keep_first;	/* keep first log block in destroy */
107 	uint8_t		zl_replay;	/* replaying records while set */
108 	uint8_t		zl_stop_sync;	/* for debugging */
109 	uint8_t		zl_writer;	/* boolean: write setup in progress */
110 	uint8_t		zl_logbias;	/* latency or throughput */
111 	uint8_t		zl_sync;	/* synchronous or asynchronous */
112 	int		zl_parse_error;	/* last zil_parse() error */
113 	uint64_t	zl_parse_blk_seq; /* highest blk seq on last parse */
114 	uint64_t	zl_parse_lr_seq; /* highest lr seq on last parse */
115 	uint64_t	zl_parse_blk_count; /* number of blocks parsed */
116 	uint64_t	zl_parse_lr_count; /* number of log records parsed */
117 	uint64_t	zl_next_batch;	/* next batch number */
118 	uint64_t	zl_com_batch;	/* committed batch number */
119 	kcondvar_t	zl_cv_batch[2];	/* batch condition variables */
120 	itxg_t		zl_itxg[TXG_SIZE]; /* intent log txg chains */
121 	list_t		zl_itx_commit_list; /* itx list to be committed */
122 	uint64_t	zl_itx_list_sz;	/* total size of records on list */
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 
145 #ifdef	__cplusplus
146 }
147 #endif
148 
149 #endif	/* _SYS_ZIL_IMPL_H */
150