module/zfs/include/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 2008 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #ifndef _SYS_ZIL_IMPL_H
  27 #define _SYS_ZIL_IMPL_H
  28
  29 #include <sys/zil.h>
  30 #include <sys/dmu_objset.h>
  31
  32 #ifdef  __cplusplus
  33 extern "C" {
  34 #endif
  35
  36 /*
  37  * Log write buffer.
  38  */
  39 typedef struct lwb {
  40         zilog_t         *lwb_zilog;     /* back pointer to log struct */
  41         blkptr_t        lwb_blk;        /* on disk address of this log blk */
  42         int             lwb_nused;      /* # used bytes in buffer */
  43         int             lwb_sz;         /* size of block and buffer */
  44         char            *lwb_buf;       /* log write buffer */
  45         zio_t           *lwb_zio;       /* zio for this buffer */
  46         uint64_t        lwb_max_txg;    /* highest txg in this lwb */
  47         txg_handle_t    lwb_txgh;       /* txg handle for txg_exit() */
  48         list_node_t     lwb_node;       /* zilog->zl_lwb_list linkage */
  49 } lwb_t;
  50
  51 /*
  52  * Vdev flushing: during a zil_commit(), we build up an AVL tree of the vdevs
  53  * we've touched so we know which ones need a write cache flush at the end.
  54  */
  55 typedef struct zil_vdev_node {
  56         uint64_t        zv_vdev;        /* vdev to be flushed */
  57         avl_node_t      zv_node;        /* AVL tree linkage */
  58 } zil_vdev_node_t;
  59
  60 /*
  61  * Stable storage intent log management structure.  One per dataset.
  62  */
  63 struct zilog {
  64         kmutex_t        zl_lock;        /* protects most zilog_t fields */
  65         struct dsl_pool *zl_dmu_pool;   /* DSL pool */
  66         spa_t           *zl_spa;        /* handle for read/write log */
  67         const zil_header_t *zl_header;  /* log header buffer */
  68         objset_t        *zl_os;         /* object set we're logging */
  69         zil_get_data_t  *zl_get_data;   /* callback to get object content */
  70         zio_t           *zl_root_zio;   /* log writer root zio */
  71         uint64_t        zl_itx_seq;     /* next itx sequence number */
  72         uint64_t        zl_commit_seq;  /* committed upto this number */
  73         uint64_t        zl_lr_seq;      /* log record sequence number */
  74         uint64_t        zl_destroy_txg; /* txg of last zil_destroy() */
  75         uint64_t        zl_replayed_seq[TXG_SIZE]; /* last replayed rec seq */
  76         uint64_t        zl_replaying_seq; /* current replay seq number */
  77         uint32_t        zl_suspend;     /* log suspend count */
  78         kcondvar_t      zl_cv_writer;   /* log writer thread completion */
  79         kcondvar_t      zl_cv_suspend;  /* log suspend completion */
  80         uint8_t         zl_suspending;  /* log is currently suspending */
  81         uint8_t         zl_keep_first;  /* keep first log block in destroy */
  82         uint8_t         zl_replay;      /* replaying records while set */
  83         uint8_t         zl_stop_sync;   /* for debugging */
  84         uint8_t         zl_writer;      /* boolean: write setup in progress */
  85         uint8_t         zl_log_error;   /* boolean: log write error */
  86         list_t          zl_itx_list;    /* in-memory itx list */
  87         uint64_t        zl_itx_list_sz; /* total size of records on list */
  88         uint64_t        zl_cur_used;    /* current commit log size used */
  89         uint64_t        zl_prev_used;   /* previous commit log size used */
  90         list_t          zl_lwb_list;    /* in-flight log write list */
  91         kmutex_t        zl_vdev_lock;   /* protects zl_vdev_tree */
  92         avl_tree_t      zl_vdev_tree;   /* vdevs to flush in zil_commit() */
  93         taskq_t         *zl_clean_taskq; /* runs lwb and itx clean tasks */
  94         avl_tree_t      zl_dva_tree;    /* track DVAs during log parse */
  95         clock_t         zl_replay_time; /* lbolt of when replay started */
  96         uint64_t        zl_replay_blks; /* number of log blocks replayed */
  97 };
  98
  99 typedef struct zil_dva_node {
 100         dva_t           zn_dva;
 101         avl_node_t      zn_node;
 102 } zil_dva_node_t;
 103
 104 #ifdef  __cplusplus
 105 }
 106 #endif
 107
 108 #endif  /* _SYS_ZIL_IMPL_H */