kernel/fs/zfs/sys/zil_impl.h

   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         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 */
 134 };
 135
 136 typedef struct zil_bp_node {
 137         dva_t           zn_dva;
 138         avl_node_t      zn_node;
 139 } zil_bp_node_t;
 140
 141 /*
 142  * Maximum amount of write data that can be put into single log block.
 143  */
 144 #define ZIL_MAX_LOG_DATA (SPA_OLD_MAXBLOCKSIZE - sizeof (zil_chain_t) - \
 145     sizeof (lr_write_t))
 146
 147 /*
 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%).
 150  */
 151 #define ZIL_MAX_WASTE_SPACE (ZIL_MAX_LOG_DATA / 8)
 152
 153 /*
 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.
 157  */
 158 #define ZIL_MAX_COPIED_DATA ((SPA_OLD_MAXBLOCKSIZE - \
 159     sizeof (zil_chain_t)) / 2 - sizeof (lr_write_t))
 160
 161 #ifdef  __cplusplus
 162 }
 163 #endif
 164
 165 #endif  /* _SYS_ZIL_IMPL_H */