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191 lines
5.2 KiB
191 lines
5.2 KiB
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1996, 1997, 1998, 1999
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* Sleepycat Software. All rights reserved.
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*
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* @(#)log.h 11.5 (Sleepycat) 9/18/99
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*/
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#ifndef _LOG_H_
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#define _LOG_H_
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struct __db_log; typedef struct __db_log DB_LOG;
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struct __fname; typedef struct __fname FNAME;
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struct __hdr; typedef struct __hdr HDR;
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struct __log; typedef struct __log LOG;
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struct __log_persist; typedef struct __log_persist LOGP;
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#ifndef MAXLFNAME
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#define LFPREFIX "log." /* Log file name prefix. */
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#define LFNAME "log.%010d" /* Log file name template. */
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#define LFNAME_V1 "log.%05d" /* Log file name template, rev 1. */
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#define MAXLFNAME 2000000000 /* Maximum log file name. */
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#endif
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#define LG_MAX_DEFAULT (10 * MEGABYTE) /* 10 MB. */
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#define LG_BSIZE_DEFAULT (32 * 1024) /* 32 KB. */
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#define LG_BASE_REGION_SIZE (60 * 1024) /* 60 KB. */
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/*
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* The log region isn't fixed size because we store the registered
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* file names there.
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*/
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#define LOG_REGION_SIZE (30 * 1024)
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/*
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* The per-process table that maps log file-id's to DB structures.
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*/
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typedef struct __db_entry {
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DB *dbp; /* Associated DB structure. */
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u_int32_t refcount; /* Reference counted. */
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u_int32_t count; /* Number of ops on a deleted db. */
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int deleted; /* File was not found during open. */
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} DB_ENTRY;
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/*
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* DB_LOG
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* Per-process log structure.
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*/
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struct __db_log {
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/*
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* These fields need to be protected for multi-threaded support.
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*
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* !!!
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* As this structure is allocated in per-process memory, the mutex may need
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* to be stored elsewhere on architectures unable to support mutexes in heap
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* memory, e.g., HP/UX 9.
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*/
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MUTEX *mutexp; /* Mutex for thread protection. */
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DB_ENTRY *dbentry; /* Recovery file-id mapping. */
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#define DB_GROW_SIZE 64
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u_int32_t dbentry_cnt; /* Entries. Grows by DB_GROW_SIZE. */
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/*
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* These fields are always accessed while the region lock is held, so they do
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* not have to be protected by the thread lock as well, OR, they are only used
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* when threads are not being used, i.e. most cursor operations are disallowed
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* on threaded logs.
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*/
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u_int32_t lfname; /* Log file "name". */
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DB_FH lfh; /* Log file handle. */
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DB_LSN c_lsn; /* Cursor: current LSN. */
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DBT c_dbt; /* Cursor: return DBT structure. */
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DB_FH c_fh; /* Cursor: file handle. */
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u_int32_t c_off; /* Cursor: previous record offset. */
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u_int32_t c_len; /* Cursor: current record length. */
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u_int8_t *bufp; /* Region buffer. */
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/* These fields are not protected. */
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DB_ENV *dbenv; /* Reference to error information. */
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REGINFO reginfo; /* Region information. */
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/*
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* These fields are used by XA; since XA forbids threaded execution, these
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* do not have to be protected.
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*/
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void *xa_info; /* Committed transaction list that
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* has to be carried between calls
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* to xa_recover. */
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DB_LSN xa_lsn; /* Position of an XA recovery scan. */
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DB_LSN xa_first; /* LSN to which we need to roll back
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for this XA recovery scan. */
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/*
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* !!!
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* Currently used to hold:
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* DBC_RECOVER (a DBC flag)
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*/
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u_int32_t flags;
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};
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/*
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* HDR --
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* Log record header.
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*/
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struct __hdr {
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u_int32_t prev; /* Previous offset. */
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u_int32_t cksum; /* Current checksum. */
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u_int32_t len; /* Current length. */
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};
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struct __log_persist {
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u_int32_t magic; /* DB_LOGMAGIC */
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u_int32_t version; /* DB_LOGVERSION */
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u_int32_t lg_max; /* Maximum file size. */
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int mode; /* Log file mode. */
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};
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/*
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* LOG --
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* Shared log region. One of these is allocated in shared memory,
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* and describes the log.
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*/
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struct __log {
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LOGP persist; /* Persistent information. */
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SH_TAILQ_HEAD(__fq) fq; /* List of file names. */
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/*
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* The lsn LSN is the file offset that we're about to write and which
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* we will return to the user.
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*/
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DB_LSN lsn; /* LSN at current file offset. */
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/*
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* The s_lsn LSN is the last LSN that we know is on disk, not just
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* written, but synced.
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*/
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DB_LSN s_lsn; /* LSN of the last sync. */
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u_int32_t len; /* Length of the last record. */
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u_int32_t w_off; /* Current write offset in the file. */
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DB_LSN chkpt_lsn; /* LSN of the last checkpoint. */
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time_t chkpt; /* Time of the last checkpoint. */
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DB_LOG_STAT stat; /* Log statistics. */
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/*
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* The f_lsn LSN is the LSN (returned to the user) that "owns" the
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* first byte of the buffer. If the record associated with the LSN
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* spans buffers, it may not reflect the physical file location of
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* the first byte of the buffer.
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*/
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DB_LSN f_lsn; /* LSN of first byte in the buffer. */
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size_t b_off; /* Current offset in the buffer. */
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roff_t buffer_off; /* Log buffer offset. */
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u_int32_t buffer_size; /* Log buffer size. */
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};
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/*
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* FNAME --
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* File name and id.
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*/
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struct __fname {
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SH_TAILQ_ENTRY q; /* File name queue. */
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u_int16_t ref; /* Reference count. */
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int32_t id; /* Logging file id. */
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DBTYPE s_type; /* Saved DB type. */
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roff_t name_off; /* Name offset. */
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u_int8_t ufid[DB_FILE_ID_LEN]; /* Unique file id. */
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};
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/* File open/close register log record opcodes. */
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#define LOG_CHECKPOINT 1 /* Checkpoint: file name/id dump. */
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#define LOG_CLOSE 2 /* File close. */
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#define LOG_OPEN 3 /* File open. */
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#include "log_auto.h"
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#include "log_ext.h"
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#endif /* _LOG_H_ */
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