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176 lines
4.8 KiB
C
176 lines
4.8 KiB
C
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1996, 1997, 1998
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* Sleepycat Software. All rights reserved.
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*
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* @(#)log.h 10.25 (Sleepycat) 4/10/98
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*/
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#ifndef _LOG_H_
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#define _LOG_H_
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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 MAXLFNAME 99999 /* Maximum log file name. */
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#define LFNAME "log.%05d" /* Log file name template. */
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#endif
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/* Default log name. */
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#define DB_DEFAULT_LOG_FILE "__db_log.share"
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#define DEFAULT_MAX (10 * MEGABYTE) /* 10 Mb. */
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/* Macros to lock/unlock the region and threads. */
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#define LOCK_LOGTHREAD(dblp) \
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if (F_ISSET(dblp, DB_AM_THREAD)) \
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(void)__db_mutex_lock((dblp)->mutexp, -1)
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#define UNLOCK_LOGTHREAD(dblp) \
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if (F_ISSET(dblp, DB_AM_THREAD)) \
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(void)__db_mutex_unlock((dblp)->mutexp, -1);
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#define LOCK_LOGREGION(dblp) \
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(void)__db_mutex_lock(&((RLAYOUT *)(dblp)->lp)->lock, \
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(dblp)->reginfo.fd)
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#define UNLOCK_LOGREGION(dblp) \
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(void)__db_mutex_unlock(&((RLAYOUT *)(dblp)->lp)->lock, \
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(dblp)->reginfo.fd)
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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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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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/* These fields need to be protected for multi-threaded support. */
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db_mutex_t *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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int lfd; /* Log file descriptor. */
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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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int c_fd; /* Cursor: file descriptor. */
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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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/* These fields are not protected. */
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LOG *lp; /* Address of the shared LOG. */
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DB_ENV *dbenv; /* Reference to error information. */
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REGINFO reginfo; /* Region information. */
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void *addr; /* Address of shalloc() region. */
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char *dir; /* Directory argument. */
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u_int32_t flags; /* Support the DB_AM_XXX 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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RLAYOUT rlayout; /* General region information. */
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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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u_int8_t buf[4 * 1024]; /* Log buffer. */
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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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u_int32_t id; /* Logging file id. */
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DBTYPE s_type; /* Saved DB type. */
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size_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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