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.
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.
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]
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]
27 /* Portions Copyright 2010 Robert Milkowski */
29 #ifndef _SYS_ZIL_IMPL_H
30 #define _SYS_ZIL_IMPL_H
33 #include <sys/dmu_objset.h>
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 */
56 * Intent log transaction lists
59 list_t i_sync_list
; /* list of synchronous itxs */
60 avl_tree_t i_async_tree
; /* tree of foids for async itxs */
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 */
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 */
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.
80 typedef struct zil_vdev_node
{
81 uint64_t zv_vdev
; /* vdev to be flushed */
82 avl_node_t zv_node
; /* AVL tree linkage */
85 #define ZIL_PREV_BLKS 16
88 * Stable storage intent log management structure. One per dataset.
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 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 txg_node_t zl_dirty_link
; /* protected by dp_dirty_zilogs list */
136 typedef struct zil_bp_node
{
142 * Maximum amount of write data that can be put into single log block.
144 #define ZIL_MAX_LOG_DATA (SPA_OLD_MAXBLOCKSIZE - sizeof (zil_chain_t) - \
148 * Maximum amount of log space we agree to waste to reduce number of
149 * WR_NEED_COPY chunks to reduce zl_get_data() overhead (~12%).
151 #define ZIL_MAX_WASTE_SPACE (ZIL_MAX_LOG_DATA / 8)
154 * Maximum amount of write data for WR_COPIED. Fall back to WR_NEED_COPY
155 * as more space efficient if we can't fit at least two log records into
156 * maximum sized log block.
158 #define ZIL_MAX_COPIED_DATA ((SPA_OLD_MAXBLOCKSIZE - \
159 sizeof (zil_chain_t)) / 2 - sizeof (lr_write_t))
165 #endif /* _SYS_ZIL_IMPL_H */