diff options
Diffstat (limited to 'db2/include/log.h')
| -rw-r--r-- | db2/include/log.h | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/db2/include/log.h b/db2/include/log.h index a192a38..405daf4 100644 --- a/db2/include/log.h +++ b/db2/include/log.h @@ -4,7 +4,7 @@ * Copyright (c) 1996, 1997 * Sleepycat Software. All rights reserved. * - * @(#)log.h 10.15 (Sleepycat) 11/2/97 + * @(#)log.h 10.16 (Sleepycat) 11/9/97 */ #ifndef _LOG_H_ @@ -117,20 +117,35 @@ struct __log { SH_TAILQ_HEAD(__fq) fq; /* List of file names. */ + /* + * The lsn LSN is the file offset that we're about to write and which + * we will return to the user. + */ DB_LSN lsn; /* LSN at current file offset. */ - DB_LSN c_lsn; /* LSN of the last checkpoint. */ + + /* + * The s_lsn LSN is the last LSN that we know is on disk, not just + * written, by synced. + */ DB_LSN s_lsn; /* LSN of the last sync. */ - DB_LSN uw_lsn; /* LSN of 1st rec not fully on disk. */ u_int32_t len; /* Length of the last record. */ - size_t b_off; /* Current offset in the buffer. */ u_int32_t w_off; /* Current write offset in the file. */ + DB_LSN c_lsn; /* LSN of the last checkpoint. */ time_t chkpt; /* Time of the last checkpoint. */ DB_LOG_STAT stat; /* Log statistics. */ + /* + * The f_lsn LSN is the LSN (returned to the user) that "owns" the + * first byte of the buffer. If the record associated with the LSN + * spans buffers, it may not reflect the physical file location of + * the first byte of the buffer. + */ + DB_LSN f_lsn; /* LSN of first byte in the buffer. */ + size_t b_off; /* Current offset in the buffer. */ u_int8_t buf[4 * 1024]; /* Log buffer. */ }; |